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:
hardware, firewall, file, format, order office supplies

Ex Output:
order office supplies


Ex Input:
camp, fish, iguana, hike, kayak

Ex Output:
iguana


Ex Input:
head, draw, deck, chips, joker

Ex Output:

head