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:
confident, popular, classy, cool, chill

Ex Output:
chill


Ex Input:
comfortable, ok, decent, fine, suspension

Ex Output:
suspension


Ex Input:
angular momentum, protein, area, skinny, fat

Ex Output:

protein