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:
squashed, cabin, flat, smooth, round

Ex Output:
smooth

Ex Input:
group, clan, hamburger, club, bar

Ex Output:
hamburger

Ex Input:
level, medium, luke, variety, fair

Ex Output:
luke