import random

def changer(n):
    answer=""
    while n>0:
        answer += str(n%2)
        n //= 2
    return answer

number = random.randint(1, 999)
answer = changer(number)
print("number to change", number)

while True:
    thestuff = input("write your answer here: ")
    if thestuff == answer[::-1]:
        print("correct answer :)")
        break
    else:
        print("wrong answer :,(")
        print("Please try again")