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:
down, kind, ashamed, sliding, unhappy

Ex Output:
sliding


Ex Input:
emotional upsets, emotional supports, down, ashamed, up

Ex Output:
up


Ex Input:
assured, refreshing, unruffled, cool, positive

Ex Output:

refreshing