# Functions go here

def int_check(question):
    """Checks users enter an integer"""
    error = "Oops - please enter an integer"
    while True:
        try:
            response = int(input(question))
            return response
        except ValueError:
            print(error)


def not_blank(question):
    """Checks that a user response is not blank"""
    while True:
        response = input(question)
        if response.strip() != "":
            return response
        print("Sorry, this can't be blank. Please try again.\n")


def string_check(question, valid_ans_list=('yes', 'no'), num_letters=1):
    """Checks that users enter the full word or the first letter of a word
    from a list of valid responses"""
    while True:
        response = input(question).lower()
        for item in valid_ans_list:
            if response == item or response == item[:num_letters]:
                return item
        print(f"Please choose an option from {valid_ans_list}")


# Main routine goes here

# Initialise valid options
payment_ans = ('cash', 'credit')
MAX_TICKETS = 5
tickets_sold = 0

# Keep going until 5 valid tickets are sold
while tickets_sold < MAX_TICKETS:
    print(f"\nTicket {tickets_sold + 1} of {MAX_TICKETS}")

    name = not_blank("Name: ")
    age = int_check("Age: ")

    if age < 12:
        print(f"{name} is too young")
        continue
    elif age > 120:
        print(f"{name} is too old")
        continue

    pay_method = string_check("Payment method (cash/credit): ", payment_ans, 2)

    print(f"{name} has bought a ticket ({pay_method})")
    tickets_sold += 1  # Only count valid tickets

# After the loop finishes
print("\n🎉 You sold all the tickets!")