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:
fib, fudge, fix, cookies, falsehood

Ex Output:
cookies


Ex Input:
fax, file, format, image, document

Ex Output:
fax


Ex Input:
down, melancholy, below, loveful, kind

Ex Output:

below