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:
format, image, fax, file, folder

Ex Output:
fax


Ex Input:
emotional supports, shameful, downward, loveful, down

Ex Output:
downward


Ex Input:
down, emotional, falling, unhappy, ashamed

Ex Output:

falling