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:
relaxed, warm, assured, level, cool

Ex Output:
warm


Ex Input:
swallow, heron, crane, flamingo, tackle

Ex Output:
tackle


Ex Input:
stingray, fish, camp, swim, hunt

Ex Output:

stingray