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:
dog, goose, dodge, duck, cat

Ex Output:
dodge


Ex Input:
fudge, brownie, unlicensed, cake, pudding

Ex Output:
unlicensed


Ex Input:
mild, popular, ethical, classy, cool

Ex Output:

mild