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:
heat, hire, burn, air, fire

Ex Output:
hire


Ex Input:
ok, wispy, jail, prime, fine

Ex Output:
ok


Ex Input:
blocking, deck, fight, box, head

Ex Output:

head