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:
unyielding, concerted, firm, combined, united

Ex Output:
unyielding


Ex Input:
answer calls, image, organize, file, correspondence

Ex Output:
image


Ex Input:
love, identity, cub, fawn, social

Ex Output:

cub