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:
variety, endure, level, fair, milky

Ex Output:
endure


Ex Input:
lifeline, knockout, deck, punch, tko

Ex Output:

lifeline