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:
glass, acrylic, wood, metal, plate

Ex Output:
plate


Ex Input:
cool, unruffled, funny, chill, ethical

Ex Output:
chill


Ex Input:
air, earth, hire, fire, inferno

Ex Output:

hire