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:
recruit, replace, sack, heat, fire

Ex Output:
heat


Ex Input:
down, lower, opposite of up, ground, remorseful

Ex Output:
remorseful


Ex Input:
frank, entree, concise, vittles, meat

Ex Output:

concise