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:
inlays, concerned, string, notes, fret

Ex Output:
concerned


Ex Input:
heat, hire, burn, air, fire

Ex Output:
hire


Ex Input:
head, box, deck, blocking, punch

Ex Output:

head