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:
lower, backward, down, falling, shameful

Ex Output:
shameful


Ex Input:
fall, pig, mallet, goose, duck

Ex Output:

fall