#functions go here

def yes_no (question):
  while True:
    response = input(question).lower()

    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 chose {want_instructions}")

print('we are done')