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: cool, unruffled, funny, chill, ethical
Example Output: chill

Example Input: gunwale, deck, punch, sail, bow
Example Output: punch

Example Input: attractive, fine, prison, level, detailed
Example Output:
prison