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:
cow, fish, dog, sea turtle, hunt

Ex Output:
hunt


Ex Input:
hire, flame, pay, fire, ban

Ex Output:
flame


Ex Input:
dive, fly, bird, beetle, swim

Ex Output:

swim