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:
cold, deal, make the grade, unprejudiced, fair

Ex Output:
unprejudiced


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

Ex Output:
worried


Ex Input:
duck, crouch, sheep, stoop, dodge

Ex Output:

sheep