Cows & Bulls - Guess the Numbe

For example, if the secret number is 1234, and the first guessed number is 5678 would result in "0 Cows, 0 Bulls" (since all the guessed digits are not in the secret number). If the guessed number is 4567 it would result in "1 Cows, 0 Bulls" (since 4 is present, but not in the exact position), and if the guessed number is 8214 it would result in "1 Cows, 2 Bulls" (since 2 and 4 are in the right positions, while 1 is in the wrong position). The game would continue until you guess the right number with "4 Bulls".