Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Example Input: fair, color, unprejudiced, fine, decent
Example Output: color

Example Input: level, knockout, deck, fight, gunwale
Example Output: gunwale

Example Input: frustrated, fret, emotional state, bored, board
Example Output:
board