def fibonacci_function():
    a, b = 0, 1
    while b < 35:
        a, b = b, a+b
        print(f"First: {a}, and then: {b}")
    print("Fibonacci")

def counting_function():
    a, b = 0, 1
    while b < 35:
        a, b = a+1, b+1
        print(f"First: {a}, and then: {b}")
    print("Counting")

#Only used once but just to show an implementation. "[input]" in invalid_message will be replaced with user_choice
def get_input(valid_inputs, input_message = ": ", invalid_message = "Invalid input. Try again."):
    user_choice = input(input_message)

    while user_choice not in valid_inputs:
        #Allow for showing user input in error message
        parsed_invalid_message = invalid_message.replace("[input]", user_choice)
        print(parsed_invalid_message)
        user_choice = input(input_message)

    return user_choice

user_choice = get_input(["Fibonacci", "Spiral", "Counting", "Count"],
                        "What do you want me to do? ",
                        "[input] is not valid.")

#Array to determine whether or not the user has chosen fibonacci
fibonacci_choices = ["Fibonacci", "Spiral"]

if user_choice in fibonacci_choices:
    fibonacci_function()

else:
    counting_function()