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:
bow, fold, hull, deck, head

Ex Output:
fold

Ex Input:
cake, fudge, rich, invent, cream

Ex Output:
invent

Ex Input:
detailed, fine, well, mad, comfortable

Ex Output:
detailed