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:
bike, beetle, leap, ant, fly

Ex Output:
bike


Ex Input:
group, clan, hamburger, club, bar

Ex Output:
hamburger


Ex Input:
happy, there, calm, ok, fine

Ex Output:

there