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:
firm, tough, solid, hard, streamline

Ex Output:
streamline


Ex Input:
fret, sad, frustrated, headstock, emotional supports

Ex Output:

headstock