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, dock, galley, joker, hull

Ex Output:
joker


Ex Input:
duplex, studio, cabin, horizontal, flat

Ex Output:
horizontal


Ex Input:
emotional state, down, sliding, up, right

Ex Output:

emotional state