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:
ok, mad, fine, bright, annoyed

Ex Output:
bright


Ex Input:
blue, current, drink, water, prompt

Ex Output:
prompt


Ex Input:
dock, apron, rudder, deck, galley

Ex Output:

apron