Bull and Cow Game

user =input("enter a 4 digit number :")
import random

comp = str(random.randint(1000,9999))

i = 0
bull = 0
cow = 0
while i<4:
    if user[i] == comp[i]:
        bull = bull + 1
    i += 1

e = 0
while e<4:
        if user[e] in comp:
            cow = cow + 1
        e = e + 1
print(comp)
print(bull)
print(cow)