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:
fret, worried, chord, notes, headstock

Ex Output:
worried


Ex Input:
wispy, jail, hot, hearing, fine

Ex Output:
hot


Ex Input:
replace, recruit, retire, fire, cool

Ex Output:

cool