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.

Ex Input:
windlass, hummingbird, neck, crane, duck

Ex Output:
windlass

Ex Input:
ring, deck, pack, box, level

Ex Output:
pack

Ex Input:
wispy, penalty, fine, money, neat

Ex Output:
neat