A simple logic game where you need to guess a generated number based on previous attempts
The output will indicate how far are you from the number
bull means that your guess contains a correct digit in the right place, cow means that your guess contains a correct digit in the wrong place
For example, if guessed number is 6138, the output for guess 1234 shall be 1 bull, 1 cow, as guess contains 1 in the wrong place and 3 in the right one