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:
unflappalbe, refreshing, funny, cool, confident

Ex Output:
refreshing


Ex Input:
knockout, blocking, crew, tko, deck

Ex Output:
crew


Ex Input:
skin, dally, dunker, fritter, dessert

Ex Output:

dally