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:
stingray, fish, camp, swim, hunt

Ex Output:
stingray


Ex Input:
cake, fudge, rich, invent, cream

Ex Output:
invent


Ex Input:
follow, swoon, deer, fawn, pester

Ex Output:

deer