ch4 ex3

import random

result=False
score=0
while not result:
  num=random.randrange(1000,10000)
  print(num)
  user_answer=input("guess if the above number is divisible by 13: ")
  if user_answer=="yes" and num%13==0:
    score+=1
    print("good guess, try again")
  elif user_answer=="no" and num%13!=0:
    print("good guess, try again")
    score+=1
  else:
    break

print("your score",score)