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:
jail, probation, fine, classy, firstrate

Ex Output:
classy


Ex Input:
fudge, mangle, falsehood, falsification, cake

Ex Output:
cake


Ex Input:
common, taut, firm, corporation, streamline

Ex Output:

taut