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:
duplex, studio, cabin, horizontal, flat

Ex Output:
horizontal


Ex Input:
leverage, solid, firm, amalgamated, concerted

Ex Output:
solid


Ex Input:
cold, fair, clime, variety, sunny

Ex Output:

variety