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:
neat, fine, classy, penalty, high quality

Ex Output:
penalty

Ex Input:
camp, fish, iguana, hike, kayak

Ex Output:
iguana

Ex Input:
neighboring, shut, locked, close, shut down

Ex Output:
neighboring