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:
swallow, heron, crane, flamingo, tackle

Ex Output:
tackle


Ex Input:
angry, joyful, tools, fearful, content

Ex Output:
tools


Ex Input:
deck, check, draw, joker, tko

Ex Output:

tko