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

Ex Output:
up


Ex Input:
duck, cat, stoop, swan, goose

Ex Output:
stoop


Ex Input:
not open, close, closest, beside, neighboring

Ex Output:

not open