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:
hot, classy, pretty, fine, probation

Ex Output:
probation


Ex Input:
foot, knee, eye, leg, ounce

Ex Output:
ounce


Ex Input:
sweet roll, fritter, goodbye, blueberry, dumpling

Ex Output:

goodbye