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:
prime, penalty, fine, mad, arrest

Ex Output:
mad


Ex Input:
fritter, apple, divide, blueberry, danish

Ex Output:
divide


Ex Input:
bambi, hatchling, kid, woo, fawn

Ex Output:

woo