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:
inlays, concerned, string, notes, fret

Ex Output:
concerned


Ex Input:
ok, wispy, jail, prime, fine

Ex Output:
ok


Ex Input:
fair, deal, color, medium, level

Ex Output:

deal