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:
impartial, fair, honorable, level, fine

Ex Output:
level

Ex Input:
vitamin c, carbs, fiber, fat, thin

Ex Output:
thin

Ex Input:
emotional upsets, loveful, unhappy, left, down

Ex Output:
left