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:
beautiful, classy, dull, comfortable, fine

Ex Output:
comfortable


Ex Input:
cool, fair, light, fine, level

Ex Output:
fine


Ex Input:
mice, trap, dog, fish, stingray

Ex Output:

trap