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:
round, duplex, flat, smooshed, townhome

Ex Output:
smooshed

Ex Input:
mild, cold, level, stormy, fair

Ex Output:
level

Ex Input:
patty, doughnut, spend, apple, fritter

Ex Output:
spend