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:
ok, wispy, jail, prime, fine

Ex Output:
ok


Ex Input:
happy, bright, well, alright, fine

Ex Output:

bright