diff --git a/lab-python-flow-control.ipynb b/lab-python-flow-control.ipynb
index f4c7391..1c7f7f8 100644
--- a/lab-python-flow-control.ipynb
+++ b/lab-python-flow-control.ipynb
@@ -37,11 +37,97 @@
     "\n",
     "3. Instead of updating the inventory by subtracting 1 from the quantity of each product, only do it for  the products that were ordered (those in \"customer_orders\")."
    ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": 1,
+   "id": "738c9e69",
+   "metadata": {},
+   "outputs": [
+    {
+     "name": "stdout",
+     "output_type": "stream",
+     "text": [
+      "\n",
+      "Please enter the quantity of the following products:\n",
+      "Customer orders: set()\n",
+      "\n",
+      "Order Statistics:\n",
+      "Percentage of Products ordered: 0.00%\n",
+      "\n",
+      "Updated inventory:\n",
+      "t-shirt: 2\n",
+      "mug: 3\n",
+      "hat: 2\n",
+      "book: 10\n",
+      "keychain: 2\n"
+     ]
+    }
+   ],
+   "source": [
+    "product = [\"t-shirt\", \"mug\", \"hat\", \"book\", \"keychain\"]\n",
+    "inventory = {}\n",
+    "\n",
+    "print(\"\\nPlease enter the quantity of the following products:\")\n",
+    "\n",
+    "for item in product:\n",
+    "    while True:  # Loop until valid input is provided\n",
+    "        quantity_str = input(f\"{item}: \")\n",
+    "        try:\n",
+    "            quantity = int(quantity_str)\n",
+    "            if quantity >= 0:  # Ensure the quantity is a non-negative number\n",
+    "                inventory[item] = quantity\n",
+    "                break  # Exit the inner loop if input is valid\n",
+    "            else:\n",
+    "                print(\"Please enter a non-negative number for the quantity.\")\n",
+    "        except ValueError:\n",
+    "            print(\"Invalid input. Please enter a valid integer.\")\n",
+    "\n",
+    "# Customer order processing\n",
+    "customer_orders = set()\n",
+    "while True:\n",
+    "    order = input(\"Enter a product to order (or 'no' to finish): \").lower()\n",
+    "    if order == 'no':\n",
+    "        break\n",
+    "    if order in product:\n",
+    "        customer_orders.add(order)\n",
+    "    else:\n",
+    "        print(\"This item is not available.\")\n",
+    "\n",
+    "print(f\"Customer orders: {customer_orders}\")\n",
+    "\n",
+    "# Order Statistics\n",
+    "ordered_list = len(customer_orders)\n",
+    "available_product = len(product)\n",
+    "percentage_ordered = (ordered_list / available_product) * 100\n",
+    "\n",
+    "print(\"\\nOrder Statistics:\")\n",
+    "print(f\"Percentage of Products ordered: {percentage_ordered:.2f}%\")\n",
+    "\n",
+    "# Updating the inventory (only for ordered items)\n",
+    "for ordered_item in customer_orders:\n",
+    "    if ordered_item in inventory and inventory[ordered_item] > 0:\n",
+    "        inventory[ordered_item] -= 1\n",
+    "    elif ordered_item in inventory: # just checking whether the item is in the inventory\n",
+    "        print(f\"{ordered_item} is out of stock.\")\n",
+    "\n",
+    "print(\"\\nUpdated inventory:\")\n",
+    "for item, quantity in inventory.items():\n",
+    "    print(f\"{item}: {quantity}\")\n"
+   ]
+  },
+  {
+   "cell_type": "code",
+   "execution_count": null,
+   "id": "eb6bfc9d",
+   "metadata": {},
+   "outputs": [],
+   "source": []
   }
  ],
  "metadata": {
   "kernelspec": {
-   "display_name": "Python 3 (ipykernel)",
+   "display_name": "Python 3",
    "language": "python",
    "name": "python3"
   },
@@ -55,7 +141,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.9.13"
+   "version": "3.12.9"
   }
  },
  "nbformat": 4,