while True:
    want_instructions = input('Do you want to see the instructions? ').lower()
    # check if user says yes or no
    if want_instructions == "yes" or want_instructions == 'y':
        print('you said yes')
        break
    elif want_instructions == "no" or want_instructions == 'n':
        print('you said no')
        break
    else:
        print('please enter yes / no')
        continue

print('we are done')