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:
group, blt, french toast, hamburger, club

Ex Output:
group


Ex Input:
hot, optimist, cool, calm, relaxed

Ex Output:
hot


Ex Input:
motherboard, firewall, file, image, schedule appointments

Ex Output:

schedule appointments