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:
club, hero, lettuce, bar, toast

Ex Output:
bar


Ex Input:
neat, beautiful, dull, fine, firstrate

Ex Output:
firstrate


Ex Input:
70, tangle, fair, mild, medium

Ex Output:

medium