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:
ok, wispy, jail, prime, fine

Ex Output:
ok


Ex Input:
handsome, dull, flyaway, attractive, fine

Ex Output:
flyaway


Ex Input:
wave, pounce, jump, fly, walk

Ex Output:

wave