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:
even, size, fair, level, ok

Ex Output:
ok


Ex Input:
deck, punch, blocking, suits, canvas

Ex Output:
suits


Ex Input:
push, stoop, duck, squat, ostrich

Ex Output:

ostrich