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:
fair, impartial, tone, well, balanced

Ex Output:
tone


Ex Input:
fire, hire, heat, inferno, earth

Ex Output:
hire


Ex Input:
fire, burn, flame, sack, air

Ex Output:

sack