def yes_no(question):
    while True:

        response =input(question).lower()


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

#Main routine

want_instructions = yes_no("Do you want to see the instructions? ")

print("we done")