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:
comfortable, money, fine, prison, jail time

Ex Output:
comfortable


Ex Input:
fine, prime, arrest, hot, jail time

Ex Output:
hot


Ex Input:
prepare, firewall, correspondence, organize, file

Ex Output:

firewall