diff --git a/src/part1/constants.py b/src/part1/constants.py
index 9abfbba2..f3458cca 100644
--- a/src/part1/constants.py
+++ b/src/part1/constants.py
@@ -19,20 +19,19 @@
 # Все константы, зависящие от ёмкостей *_BITS, должны вычисляться из них.
 
 # Twitter's original Snowflake epoch: 2010-11-04 01:42:54.657 UTC.
-EPOCH_MS_DEFAULT: Final[int] = 0
+EPOCH_MS_DEFAULT: Final[int] = 1288834974657
 
 # Node identifier used when the caller does not supply one.
-NODE_ID_DEFAULT: Final[int] = 0
+NODE_ID_DEFAULT: Final[int] = 1
 
 # Width of each field, in bits.
-TIMESTAMP_BITS: Final[int] = 0
-NODE_ID_BITS: Final[int] = 0
-SEQUENCE_ID_BITS: Final[int] = 0
+TIMESTAMP_BITS: Final[int] = 41
+NODE_ID_BITS: Final[int] = 10
+SEQUENCE_ID_BITS: Final[int] = 12
 
 # Largest value each field can hold.
-TIMESTAMP_MS_MAX: Final[int] = 0
-NODE_ID_MAX: Final[int] = 0
-SEQUENCE_ID_MAX: Final[int] = 0
-
+TIMESTAMP_MS_MAX: Final[int] = 2**TIMESTAMP_BITS - 1
+NODE_ID_MAX: Final[int] = 2**NODE_ID_BITS - 1
+SEQUENCE_ID_MAX: Final[int] = 2**SEQUENCE_ID_BITS - 1
 # Здесь можно добавить собственные вспомогательные константы
 # (например, сдвиги полей при сборке идентификатора).
diff --git a/src/part1/snowflake.py b/src/part1/snowflake.py
index d3abf050..45f9962a 100644
--- a/src/part1/snowflake.py
+++ b/src/part1/snowflake.py
@@ -13,13 +13,16 @@
 :func:`decode_node_id` and :func:`decode_sequence_id`.
 """
 
-import time  # noqa: F401
+import time
 
-from .constants import (  # noqa: F401
+from .constants import (
     EPOCH_MS_DEFAULT,
+    NODE_ID_BITS,
     NODE_ID_DEFAULT,
     NODE_ID_MAX,
+    SEQUENCE_ID_BITS,
     SEQUENCE_ID_MAX,
+    TIMESTAMP_BITS,
     TIMESTAMP_MS_MAX,
 )
 
@@ -35,7 +38,7 @@ def read_current_millis(epoch_ms: int) -> int:
         negative if ``epoch_ms`` lies in the future.
     """
     # TODO: реализуйте функцию
-    return 0
+    return int(time.time() * 1000 - epoch_ms)
 
 
 def decode_timestamp_ms(snowflake_id: int, epoch_ms: int = EPOCH_MS_DEFAULT) -> int:
@@ -51,7 +54,8 @@ def decode_timestamp_ms(snowflake_id: int, epoch_ms: int = EPOCH_MS_DEFAULT) ->
         generated.
     """
     # TODO: реализуйте функцию
-    return 0
+    timestamp_ms = (snowflake_id >> 22) & (2**TIMESTAMP_BITS - 1)
+    return int(timestamp_ms + epoch_ms)
 
 
 def decode_node_id(snowflake_id: int) -> int:
@@ -65,7 +69,7 @@ def decode_node_id(snowflake_id: int) -> int:
         ``[0, NODE_ID_MAX]``.
     """
     # TODO: реализуйте функцию
-    return 0
+    return int((snowflake_id >> 12) & (2**NODE_ID_BITS - 1))
 
 
 def decode_sequence_id(snowflake_id: int) -> int:
@@ -79,7 +83,7 @@ def decode_sequence_id(snowflake_id: int) -> int:
         the range ``[0, SEQUENCE_ID_MAX]``.
     """
     # TODO: реализуйте функцию
-    return 0
+    return int(snowflake_id & (2**SEQUENCE_ID_BITS - 1))
 
 
 def generate_snowflake_id(
@@ -111,4 +115,17 @@ def generate_snowflake_id(
         cases an explanatory message is printed to stdout first.
     """
     # TODO: реализуйте функцию
-    return 0
+    if node_id < 0 or NODE_ID_MAX < node_id:
+        print(f"node_id must be in [{0}; {NODE_ID_MAX}]")
+
+    if 0 < sequence_id or sequence_id < SEQUENCE_ID_MAX:
+        print(f"node_id must be in [{0}; {NODE_ID_MAX}]")
+
+    timestamp_ms = int(time.time() * 1000 - epoch_ms)
+    if timestamp_ms > TIMESTAMP_MS_MAX:
+        print("overflows")
+        return None
+
+    snowflake_id = (0b0 << 63) | (timestamp_ms << 22) | (node_id << 12) | (sequence_id)
+
+    return int(snowflake_id)
diff --git a/src/part2/cart.py b/src/part2/cart.py
index 063f9aea..fcbe7e8d 100644
--- a/src/part2/cart.py
+++ b/src/part2/cart.py
@@ -11,8 +11,8 @@
 
 from typing import Final
 
-from .crud import read_product, update_product  # noqa: F401
-from .storage import (  # noqa: F401
+from .crud import read_product, update_product
+from .storage import (
     NAME_INDEX,
     PRICE_INDEX,
     QUANTITY_INDEX,
@@ -24,7 +24,17 @@
 
 # TODO: задайте позиции полей внутри кортежа CartLine
 LINE_PRODUCT_ID_INDEX: Final = 0
-LINE_QUANTITY_INDEX: Final = 0
+LINE_QUANTITY_INDEX: Final = 1
+
+
+def find_cart_line(
+    cart: list[CartLine],
+    product_id: int,
+) -> CartLine | None:
+    for line in cart:
+        if line[LINE_PRODUCT_ID_INDEX] == product_id:
+            return line
+    return None
 
 
 def add_to_cart(
@@ -54,7 +64,36 @@ def add_to_cart(
         when the product is unknown or the store cannot cover the request.
     """
     # TODO: реализуйте функцию
-    return (0, 0)
+
+    product = read_product(storage, product_id)
+    if product is None:
+        return None
+
+    stock_quantity = product[QUANTITY_INDEX]
+    if stock_quantity < quantity:
+        print(
+            f"not enough stock for product {product_id}: {stock_quantity} available, {quantity} requested"
+        )
+        return None
+
+    new_stock_quantity = stock_quantity - quantity
+    update_product(
+        storage,
+        product_id,
+        (product[NAME_INDEX], product[PRICE_INDEX], new_stock_quantity),
+    )
+
+    index = 0
+    for line in cart:
+        if line[LINE_PRODUCT_ID_INDEX] == product_id:
+            updated_product = (product_id, line[LINE_PRODUCT_ID_INDEX] + quantity)
+            cart[index] = updated_product
+            return updated_product
+
+    new_line = (product_id, quantity)
+    cart.append(new_line)
+
+    return new_line
 
 
 def remove_from_cart(
@@ -86,4 +125,33 @@ def remove_from_cart(
         line for the product or holds too few units.
     """
     # TODO: реализуйте функцию
-    return (0, 0)
+    line = find_cart_line(cart, product_id)
+    if line is None:
+        print(f"product {product_id} is not in the cart")
+        return None
+
+    cart_quantity = line[LINE_QUANTITY_INDEX]
+    if cart_quantity < quantity:
+        print(
+            f"cart holds only {cart_quantity} unit(s) of product <{product_id}, cannot remove {quantity}"
+        )
+        return None
+    product = read_product(storage, product_id)
+    if product is None:
+        return None
+    update_product(
+        storage,
+        product_id,
+        (product[NAME_INDEX], product[PRICE_INDEX], product[QUANTITY_INDEX] + quantity),
+    )
+
+    new_quantity = cart_quantity - quantity
+    for index in range(len(cart)):
+        if cart[index][LINE_PRODUCT_ID_INDEX] == product_id:
+            if new_quantity == 0:
+                del cart[index]
+                return (product_id, 0)
+            updated_product = (product_id, new_quantity)
+            cart[index] = updated_product
+            return updated_product
+    return None
diff --git a/src/part2/crud.py b/src/part2/crud.py
index d026cbcb..9da32673 100644
--- a/src/part2/crud.py
+++ b/src/part2/crud.py
@@ -14,13 +14,13 @@
 
 from decimal import Decimal
 
-from .storage import (  # noqa: F401
+from .storage import (
     NAME_INDEX,
     PRODUCT_ID_INDEX,
     PRODUCT_ID_MIN,
     Product,
 )
-from .utils import normalize_price  # noqa: F401
+from .utils import normalize_price
 
 
 def generate_product_id(storage: list[Product]) -> int:
@@ -35,7 +35,9 @@ def generate_product_id(storage: list[Product]) -> int:
         empty.
     """
     # TODO: реализуйте функцию
-    return 0
+    if not storage:
+        return PRODUCT_ID_MIN
+    return max(product[PRODUCT_ID_INDEX] for product in storage) + 1
 
 
 def create_product(
@@ -57,7 +59,17 @@ def create_product(
         name is printed.
     """
     # TODO: реализуйте функцию
-    return 0
+    name, price, quantity = fields
+
+    for product in storage:
+        if product[NAME_INDEX] == name:
+            print(f"product name '{name}' is already taken.")
+            return None
+
+    product_id = generate_product_id(storage)
+    normalized_price = normalize_price(price)
+    storage.append((product_id, name, normalized_price, quantity))
+    return product_id
 
 
 def read_product(storage: list[Product], product_id: int) -> Product | None:
@@ -73,7 +85,11 @@ def read_product(storage: list[Product], product_id: int) -> Product | None:
         printed in that case).
     """
     # TODO: реализуйте функцию
-    return (0, "", Decimal(0), 0)
+    for product in storage:
+        if product[PRODUCT_ID_INDEX] == product_id:
+            return product
+        print(f"no product with id {product_id}")
+    return None
 
 
 def update_product(
@@ -99,8 +115,18 @@ def update_product(
         ``None`` when no product carries that identifier (``storage`` is
         left unchanged and a message is printed).
     """
+    name, price, quantity = fields
+    normalized_price = normalize_price(price)
+
     # TODO: реализуйте функцию
-    return (0, "", Decimal(0), 0)
+
+    for index, product in enumerate(storage):
+        if product[PRODUCT_ID_INDEX] == product_id:
+            updated_product = (product_id, name, normalized_price, quantity)
+            storage[index] = updated_product
+            return updated_product
+    print(f"no product with id {product_id}")
+    return None
 
 
 def delete_product(storage: list[Product], product_id: int) -> int | None:
@@ -117,4 +143,9 @@ def delete_product(storage: list[Product], product_id: int) -> int | None:
         a message is printed).
     """
     # TODO: реализуйте функцию
-    return 0
+    for index, product in enumerate(storage):
+        if product[PRODUCT_ID_INDEX] == product_id:
+            del storage[index]
+            return product_id
+    print(f"no product with id {product_id}")
+    return None
diff --git a/src/part2/storage.py b/src/part2/storage.py
index b63d5fc7..35821c5f 100644
--- a/src/part2/storage.py
+++ b/src/part2/storage.py
@@ -26,9 +26,9 @@
 
 # TODO: задайте позиции полей внутри кортежа Product
 PRODUCT_ID_INDEX: Final = 0
-NAME_INDEX: Final = 0
-PRICE_INDEX: Final = 0
-QUANTITY_INDEX: Final = 0
+NAME_INDEX: Final = 1
+PRICE_INDEX: Final = 2
+QUANTITY_INDEX: Final = 3
 
 # TODO: задайте идентификатор первого товара в пустом хранилище
-PRODUCT_ID_MIN: Final[int] = 0
+PRODUCT_ID_MIN: Final[int] = 1
diff --git a/src/part2/utils.py b/src/part2/utils.py
index 11bd7a76..2b6aa266 100644
--- a/src/part2/utils.py
+++ b/src/part2/utils.py
@@ -6,13 +6,13 @@
 currency values free of binary floating-point error.
 """
 
-from decimal import ROUND_HALF_UP, Decimal  # noqa: F401
+from decimal import ROUND_HALF_UP, Decimal
 from typing import Final
 
 
 # TODO: задайте число знаков после запятой и шаг квантования
-PRICE_PRECISION: Final[int] = 0
-PRICE_STEP: Final = Decimal(0)
+PRICE_PRECISION: Final[int] = 2
+PRICE_STEP: Final = Decimal(1).scaleb(-PRICE_PRECISION)
 
 
 def normalize_price(price: Decimal) -> Decimal:
@@ -26,4 +26,4 @@ def normalize_price(price: Decimal) -> Decimal:
         with halves rounded up.
     """
     # TODO: реализуйте функцию
-    return Decimal(0)
+    return price.quantize(PRICE_STEP, rounding=ROUND_HALF_UP)
diff --git a/src/part4/cart.py b/src/part4/cart.py
index aed9bb72..a0ff3822 100644
--- a/src/part4/cart.py
+++ b/src/part4/cart.py
@@ -9,7 +9,8 @@
 an explanatory message to stdout and returns ``None``.
 """
 
-from .storage import Product
+from .crud import read_product, update_product
+from .storage import QUANTITY_KEY, Product
 
 
 # TODO: при необходимости добавьте свои вспомогательные функции
@@ -47,7 +48,29 @@ def add_to_cart(
         request.
     """
     # TODO: реализуйте функцию
-    return 0
+    storage_product = read_product(storage, product_id)
+    if storage_product is None:
+        return None
+
+    if storage_product[QUANTITY_KEY] < quantity:
+        print(
+            f"not enough stock for product {product_id}: "
+            f"{storage_product[QUANTITY_KEY]} available, {quantity} requested"
+        )
+        return None
+
+    update_product(
+        storage,
+        product_names,
+        product_id,
+        {QUANTITY_KEY: storage_product[QUANTITY_KEY] - quantity},
+    )
+
+    if product_id in cart:
+        cart[product_id] += quantity
+    else:
+        cart[product_id] = quantity
+    return cart[product_id]
 
 
 def remove_from_cart(
@@ -84,4 +107,28 @@ def remove_from_cart(
         the cart does not hold the product or holds too few units.
     """
     # TODO: реализуйте функцию
-    return 0
+
+    if product_id not in cart:
+        print(f"product {product_id} is not in the cart")
+        return None
+    if cart[product_id] < quantity:
+        print(
+            f"cart holds only {cart[product_id]} unit(s) "
+            f"of product {product_id}, cannot remove {quantity}"
+        )
+        return None
+    if product_id not in storage:
+        print(f"no product with id {product_id}")
+        return None
+
+    update_product(
+        storage,
+        product_names,
+        product_id,
+        {QUANTITY_KEY: storage[product_id][QUANTITY_KEY] + quantity},
+    )
+    cart[product_id] -= quantity
+    if cart[product_id] == 0:
+        del cart[product_id]
+        return 0
+    return cart[product_id]
diff --git a/src/part4/crud.py b/src/part4/crud.py
index 471eff00..acefee1b 100644
--- a/src/part4/crud.py
+++ b/src/part4/crud.py
@@ -23,16 +23,16 @@
 than a scan over ``storage.values()``.
 """
 
-import uuid  # noqa: F401
+import uuid
 from typing import Any
 
-from .storage import (  # noqa: F401
+from .storage import (
     NAME_KEY,
     PRICE_KEY,
     QUANTITY_KEY,
     Product,
 )
-from .utils import normalize_price, normalize_product_name  # noqa: F401
+from .utils import normalize_price, normalize_product_name
 
 
 def generate_product_id() -> str:
@@ -42,7 +42,7 @@ def generate_product_id() -> str:
         A freshly generated UUID, stringified.
     """
     # TODO: реализуйте функцию
-    return ""
+    return str(uuid.uuid4())
 
 
 def create_product(
@@ -74,7 +74,23 @@ def create_product(
         message is printed.
     """
     # TODO: реализуйте функцию
-    return ""
+    normalized_name = normalize_product_name(fields[NAME_KEY])
+
+    if not normalized_name:
+        print("product name must not be blank")
+        return None
+    if normalized_name in product_names:
+        print(f"product name '{normalized_name}' is already taken")
+        return None
+
+    ID = generate_product_id()
+    storage[ID] = {
+        NAME_KEY: normalized_name,
+        PRICE_KEY: normalize_price(fields[PRICE_KEY]),
+        QUANTITY_KEY: fields[QUANTITY_KEY],
+    }
+    product_names.add(normalized_name)
+    return ID
 
 
 def read_product(storage: dict[str, Product], product_id: str) -> Product | None:
@@ -89,7 +105,10 @@ def read_product(storage: dict[str, Product], product_id: str) -> Product | None
         that identifier (a message is printed in that case).
     """
     # TODO: реализуйте функцию
-    return {}
+    if product_id not in storage:
+        print(f"no product with id {product_id}")
+        return None
+    return storage[product_id]
 
 
 def update_product(
@@ -130,7 +149,28 @@ def update_product(
         own current name is allowed.
     """
     # TODO: реализуйте функцию
-    return {}
+    if product_id not in storage:
+        print(f"no product with id {product_id}")
+        return None
+
+    if NAME_KEY in fields:
+        if not fields[NAME_KEY]:
+            print("product name must not be blank")
+            return None
+        if (
+            fields[NAME_KEY] != storage[product_id][NAME_KEY]
+            and fields[NAME_KEY] in product_names
+        ):
+            print(f"product name '{fields[NAME_KEY]}' is already taken")
+            return None
+        product_names.remove(storage[product_id][NAME_KEY])
+        product_names.add(fields[NAME_KEY])
+        storage[product_id][NAME_KEY] = fields[NAME_KEY]
+
+    if PRICE_KEY in fields:
+        fields[PRICE_KEY] = normalize_price(fields[PRICE_KEY])
+
+    return storage[product_id]
 
 
 def delete_product(
@@ -154,4 +194,11 @@ def delete_product(
         are left unchanged and a message is printed).
     """
     # TODO: реализуйте функцию
-    return ""
+    if product_id not in storage:
+        print(f"no product with id {product_id}")
+        return None
+
+    storage_new = storage.pop(product_id)
+    product_names.remove(storage_new[NAME_KEY])
+
+    return product_id
diff --git a/src/part4/run_admin.py b/src/part4/run_admin.py
index 2247b29b..7b866b30 100644
--- a/src/part4/run_admin.py
+++ b/src/part4/run_admin.py
@@ -28,22 +28,33 @@
 is left untouched and the loop keeps running; only ``exit`` stops it.
 """
 
-from decimal import Decimal, InvalidOperation  # noqa: F401
+from decimal import Decimal, InvalidOperation
 from typing import Final
 
-from .crud import (  # noqa: F401
+from .crud import (
     create_product,
     delete_product,
     read_product,
     update_product,
 )
-from .storage import NAME_KEY, PRICE_KEY, QUANTITY_KEY, Product  # noqa: F401
-from .utils import get_storage_str_representation  # noqa: F401
+from .storage import NAME_KEY, PRICE_KEY, QUANTITY_KEY, Product
+from .utils import get_storage_str_representation
 
 
 # TODO: задайте приглашение и текст справки (используйте своё решение части 3)
-PROMPT: Final[str] = ""
-HELP_TEXT: Final[str] = ""
+PROMPT: Final[str] = "admin> "
+HELP_TEXT: Final[str] = """Available commands:
+  help                                       show this message
+  exit                                       leave the console
+  show                                       print the whole store as a table
+  create <name...> <price> <quantity>        add a product, print its new id
+  read <id>                                  print the product with that id
+  update <id> <name...> <price> <quantity>   overwrite that product's fields
+  delete <id>                                remove the product with that id
+
+For create and update the price and quantity are the last two words of the
+line; everything before them is the product name, so it may contain spaces
+(for example "Gibson SG Junior") and needs no quoting."""
 
 
 def show_help() -> None:
@@ -54,6 +65,7 @@ def show_help() -> None:
     note on how multi-word names are parsed.
     """
     # TODO: реализуйте функцию (используйте своё решение части 3)
+    print(HELP_TEXT)
 
 
 def print_result(result: object) -> None:
@@ -65,6 +77,8 @@ def print_result(result: object) -> None:
             printed in that case.
     """
     # TODO: реализуйте функцию (используйте своё решение части 3)
+    if result is not None:
+        print(result)
 
 
 def run_command(
@@ -92,7 +106,59 @@ def run_command(
             ``update`` does not parse as a decimal number.
     """
     # TODO: реализуйте функцию
-    return False
+    parts = line.split()
+    if not parts:
+        print(f"'{line}' is not a command")
+        return True
+
+    actions = parts[0]
+
+    match actions:
+        case "help" if len(parts) == 1:
+            show_help()
+            return True
+
+        case "exit" if len(parts) == 1:
+            return False
+
+        case "show" if len(parts) == 1:
+            print_result(get_storage_str_representation(storage))
+            return True
+
+        case "create" if len(parts) >= 4:
+            name = " ".join(parts[1:-2])
+            price = Decimal(parts[-2])
+            quantity = int(parts[-1])
+            fields = {NAME_KEY: name, PRICE_KEY: price, QUANTITY_KEY: quantity}
+            created_id = create_product(storage, product_names, fields)
+            print_result(created_id)
+            return True
+
+        case "read" if len(parts) == 2:
+            product_id = parts[1]
+            result_read = read_product(storage, product_id)
+            print_result(result_read)
+            return True
+
+        case "delete" if len(parts) == 2:
+            product_id = parts[1]
+            result_delete = delete_product(storage, product_names, product_id)
+            print_result(result_delete)
+            return True
+
+        case "update" if len(parts) >= 5:
+            product_id = parts[1]
+            name = " ".join(parts[2:-2])
+            price = Decimal(parts[-2])
+            quantity = int(parts[-1])
+            fields = {NAME_KEY: name, PRICE_KEY: price, QUANTITY_KEY: quantity}
+            updated_prod = update_product(storage, product_names, product_id, fields)
+            print_result(updated_prod)
+            return True
+
+        case _:
+            print(f"'{line}' is not a command")
+            return True
 
 
 def main() -> None:
diff --git a/src/part4/storage.py b/src/part4/storage.py
index 9acedf07..a25f6253 100644
--- a/src/part4/storage.py
+++ b/src/part4/storage.py
@@ -40,6 +40,6 @@
 
 # Name of each field inside a Product record.
 # TODO: задайте имена полей записи
-NAME_KEY: Final = ""
-PRICE_KEY: Final = ""
-QUANTITY_KEY: Final = ""
+NAME_KEY: Final = "name"
+PRICE_KEY: Final = "price"
+QUANTITY_KEY: Final = "quantity"
diff --git a/src/part4/utils.py b/src/part4/utils.py
index d2a940ea..5b620460 100644
--- a/src/part4/utils.py
+++ b/src/part4/utils.py
@@ -18,10 +18,10 @@
   the longest value it holds in that particular call.
 """
 
-from decimal import ROUND_HALF_UP, Decimal  # noqa: F401
+from decimal import ROUND_HALF_UP, Decimal
 from typing import Final
 
-from .storage import (  # noqa: F401
+from .storage import (
     NAME_KEY,
     PRICE_KEY,
     QUANTITY_KEY,
@@ -33,14 +33,14 @@
 # Quantisation step derived from PRICE_PRECISION, e.g. Decimal("0.01").
 # TODO: задайте число знаков после запятой и шаг квантования (используйте своё
 # решение части 3)
-PRICE_PRECISION: Final[int] = 0
-PRICE_STEP: Final = Decimal(0)
+PRICE_PRECISION: Final[int] = 2
+PRICE_STEP: Final = Decimal(1).scaleb(-PRICE_PRECISION)
 
 # Column headers of the table produced by get_storage_str_representation,
 # left to right. The width of each column is not fixed here -- it is
 # measured per call from the data (see the function).
 # TODO: задайте заголовки столбцов таблицы (используйте своё решение части 3)
-TABLE_HEADERS: Final[tuple[str, ...]] = ()
+TABLE_HEADERS: Final[tuple[str, ...]] = ("ID", "name", "price", "quantity")
 
 
 def normalize_price(price: Decimal) -> Decimal:
@@ -54,7 +54,7 @@ def normalize_price(price: Decimal) -> Decimal:
         with halves rounded up.
     """
     # TODO: реализуйте функцию (используйте своё решение части 3)
-    return Decimal(0)
+    return price.quantize(PRICE_STEP, ROUND_HALF_UP)
 
 
 def normalize_product_name(name: str) -> str:
@@ -72,10 +72,18 @@ def normalize_product_name(name: str) -> str:
         whitespace.
     """
     # TODO: реализуйте функцию (используйте своё решение части 3)
-    return ""
+    names = name.split()
+    normalized_names = "".join(names).lower()
+    return normalized_names
 
 
 # TODO: при необходимости добавьте свои вспомогательные функции
+def separate(lengths: tuple[int, ...]) -> str:
+    sep = "|"
+    for length in lengths:
+        sep += "-" + "-" * length + "-|"
+    sep += "\n"
+    return sep
 
 
 def get_storage_str_representation(storage: dict[str, Product]) -> str:
@@ -97,4 +105,23 @@ def get_storage_str_representation(storage: dict[str, Product]) -> str:
         returned, sized to the header labels.
     """
     # TODO: реализуйте функцию (используйте своё решение части 3)
-    return ""
+    rows = []
+    for ID, data in storage.items():
+        rows.append(ID, data[NAME_KEY], str(data[PRICE_KEY]), str(data[QUANTITY_KEY]))
+    widths = []
+    for i, header in enumerate(TABLE_HEADERS):
+        max_len = len(header)
+        for row in rows:
+            max_len = max(max_len, len(row[i]))
+        widths.append(max_len)
+
+    def format_row(values: tuple[str, ...]) -> str:
+        return "|" + "".join(
+            " " + values[i] + " " * (widths[i] - len(values[i])) + "|"
+            for i in range(len(values))
+        )
+
+    table_header = format_row(TABLE_HEADERS)
+    separator = separate(tuple(widths)).rstrip("\n")
+    lines = [format_row(row) for row in rows]
+    return "\n".join([table_header, separator, *lines])