def string_check(question, valid_list=('yes', 'no'), num_letters=1):
    """Checks that users enter the full word or the first 'n' letters from a list"""
    while True:
        response = input(question).strip().lower()

        for item in valid_list:
            item_low = item.lower()
            if response == item_low:
                return item  # Return actual item (with correct casing)
            elif response == item_low[:num_letters]:
                return item

        print(f"Please choose an option from {valid_list}")


# Main routine goes here

# Initialise pizza numbers
MAX_PIZZAS = 5
pizzas_sold = 0

while True:
    yes_no_list = ['yes', 'no']
    pizza_sizes = ['small', 'medium', 'large']
    gourmet_options = ['Pepperoni', "Hawaiian", "Margherita", "BBQ Chicken",
                       "Meat Lovers", "Cheese Pizza", "Veggie Pizza",
                       "Kebab Pizza", "Spaghetti Pizza", "Smash Burger"]
    special_pizzas = ["Sushi Pizza", "S'more Pizza"]
    extra_toppings = ["Extra cheese", "Mushrooms", "Onions", "Pineapple", "Green Peppers"]

    # Ask for pizza type
    choose_pizza = input("Choose a gourmet option (or 'xxx' to quit): ").lower()
    if choose_pizza == "xxx":
        print("Exiting pizza ordering...")
        break

    chosen_size = string_check("What size of the pizza would you like? ", pizza_sizes, 2)
    print(f"You chose {chosen_size}")

    extra_toppings_pizza = string_check("Would you like extra toppings? ", yes_no_list, 3)
    print(f"You chose {extra_toppings_pizza}")

    if extra_toppings_pizza == "yes":
        extra_toppings_choose = string_check("Extra toppings: ", extra_toppings, 99)
        print(f"you chose {extra_toppings_choose}")

    want_special_pizzas = string_check("We have limited edition special pizzas, are you interested? ", yes_no_list,
                                       4)
    print(f"you chose {want_special_pizzas}")

    if want_special_pizzas == "yes":
        special_pizzas_choose = string_check("What type of special pizza would you like? ", special_pizzas, 99)
        print(f"you chose {special_pizzas_choose}")

    # Every time a pizza is ordered, it adds 1 out of the 5 threshold
    pizzas_sold += 1

    # Once pizza has reached 5/5, the program breaks continuing to something else
    if pizzas_sold >= MAX_PIZZAS:
        print(f"You've reached the maximum of {MAX_PIZZAS} pizzas.")
        break

    another_pizza = string_check("Would you like another pizza? 🍕 ", yes_no_list, 4)
    print(f"You chose {another_pizza}")

    if another_pizza == "no":
        break