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:
deal, fair, endure, windy, ghostly

Ex Output:
ghostly


Ex Input:
jog, flap, fly, bee, bus

Ex Output:

bee