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:
level, tone, fair, impartial, milky

Ex Output:
impartial


Ex Input:
invent, smuggled, smear, fudge, pie

Ex Output:
pie


Ex Input:
sprint, cow, duck, hike, stoop

Ex Output:

cow