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:
emotional state, opposite of up, unhappy, down, miserable

Ex Output:
opposite of up


Ex Input:
galley, head, suits, deck, dock

Ex Output:
suits


Ex Input:
mad, detached, fine, probation, acceptable

Ex Output:

probation