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:
cool, relaxed, mild, unflappalbe, assured

Ex Output:
mild


Ex Input:
apartment, round, valley, flat, even

Ex Output:
valley


Ex Input:
annoyed, acceptable, exquisite, detached, fine

Ex Output:

exquisite