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:
replace, fire, retire, air, remove

Ex Output:
air


Ex Input:
meeting, community, lettuce, club, cinema

Ex Output:
lettuce


Ex Input:
fat, heavy, ugly, capacitance, heavy

Ex Output:

heavy