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:
early, water, delayed, history, current

Ex Output:
water


Ex Input:
emotional upsets, emotional supports, down, ashamed, up

Ex Output:
up


Ex Input:
brash, frank, hot dog, grub, vittles

Ex Output:

brash