# functions go here

def yes_no(question):
    while True:

        response = input(question).lower()

        # check if the user says yes / no / y / n
        if response == "yes" or response == "y":
            return "yes"
        elif response == "no" or response == "n":
            return "no"
        else:
            print("please enter yes / no")

# Main routine

# testing loop...
while True:
    want_instructions = yes_no("do you want to see the instructions? ")
    print(f"you choose {want_instructions}")

print("we done")