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:
stormy, fair, just, mild, brisk

Ex Output:
just


Ex Input:
beautiful, classy, dull, comfortable, fine

Ex Output:
comfortable


Ex Input:
synergy, firm, corporation, amalgamated, hard

Ex Output:

hard