import random

random.seed()
cows, bulls, play = 0, 0, 1
code = []

for i in range(4):
    code.append(str(random.randint(0,9)))
print(code)

while play == 1:
    guess = list(input("Guess the four digits: "))
    for i, letters in enumerate(code):
        incremented = 0
        similarity_range = []
        for j in range(len(code)):
            if guess[j] == letters:
                similarity_range.append(j)
        for k in range(len(code)):
            if incremented == 1:
                break
            if guess[k] == letters:
                for t in similarity_range:
                    if k == t:
                        cows += 1
                        incremented = 1
                        break
                    if k == 3:
                        bulls += 1
    print("{} cows, {} bulls".format(cows, bulls))
    if cows == 4:
        print("Congratulations!")
        break
    else:
        cows = 0
        bulls = 0
        play = int(input("Press 1 to keep guessing: "))