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:
cool, unruffled, funny, chill, ethical

Ex Output:
chill


Ex Input:
deck, check, joker, board, bridge

Ex Output:
bridge


Ex Input:
scorching, cool, hot, popular, refreshing

Ex Output:

popular