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:
fire, instruct, inferno, retire, scold

Ex Output:
inferno


Ex Input:
current, water, detests, blue, jetstream

Ex Output:
detests


Ex Input:
frustrated, amp, string, fret, headstock

Ex Output:

frustrated