This is a game similar to "Mastermind", but with letters as clues.
Your job is to guess the hidden word in five attempts.
Supply a five-letter word to get clues.
Type a five-letter word without duplicate letters (eg not STEEL).
Press the [Return] key to see the result.
If a letter stays BLACK, it is not in the secret word.
If a letter turns GREEN, it is in the correct position in the secret word.
A RED letter is in the word, but in the wrong position.
