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:
fish, bat, mice, dog, hiking

Ex Output:
hiking


Ex Input:
corner, deck, fight, knockout, blind

Ex Output:
blind


Ex Input:
replace, heavy, fudge, rich, chocolate cake

Ex Output:

replace