Word/Number Guess - Cows Bulls

* There is a hidden word / number that the user must guess in a certain attempts * The attempts depend on the level of difficulty and the number of letters selected by the user * Each guess by the user will be matched against the hidden word/number and then reveals the number of cows and bulls in that particular guess * COW means, one of the letters in the guess is present in the hidden word but not in the exact position * BULL means, one of the letters in the guess is present in the hidden word in the exact position * User can get the hints and the number of hints depends on the level of difficulty and the number of letters selected * User wins if he/she can guess the hidden word in specified attempts based on the number of cows and bulls provided for each guess * User loses if he/she fails to guess the hidden word in specified attempts