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:
air, fire, hire, ban, promote

Ex Output:
air


Ex Input:
level, impartial, fair, tone, cool

Ex Output:
impartial


Ex Input:
high quality, level, hot, fine, well

Ex Output:

well