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:
fly, flutter, bus, drive, fish

Ex Output:
fish


Ex Input:
suppressed, fawn, follow, cajole, kitten

Ex Output:
kitten


Ex Input:
emotionalities, kind, emotional supports, backward, down

Ex Output:

backward