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:
apartment, round, valley, flat, even

Ex Output:
valley


Ex Input:
deck, punch, blocking, suits, canvas

Ex Output:
suits


Ex Input:
crane, digger, mallet, egret, swallow

Ex Output:

digger