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:
deck, sail, crew, head, fold

Ex Output:
fold


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

Ex Output:
valley


Ex Input:
out of service, touching, adjacent, close, closest

Ex Output:

out of service