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:
current, history, wave, jetstream, whirlpool

Ex Output:
history


Ex Input:
fritter, apple, divide, blueberry, danish

Ex Output:
divide


Ex Input:
falsehood, lie, wrongful, cookies, fudge

Ex Output:

cookies