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:
fine, classy, mad, happy, relaxed

Ex Output:
classy


Ex Input:
fret, worried, chord, notes, headstock

Ex Output:
worried


Ex Input:
instruct, fire, recruit, let go, cool

Ex Output:

cool