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:
ghostly, fair, medium, cold, well

Ex Output:
cold


Ex Input:
pounce, car, bats, fly, grasshopper

Ex Output:
car


Ex Input:
paved, even, hill, level, flat

Ex Output:

even