Given a category and a set of five words, find the word from the set that does not belong (i.e. is the least relevant) with the other words in the category. Words are separated by commas.

Ex Input:
Category: type of rigidity 
Words: rigged, firm, unyielding, streamline, taut

Ex Output:
streamline


Ex Input:
Category: guitar part 
Words: neck, strap lock, fret, angry, notes

Ex Output:
angry


Ex Input:
Category: moral characteristic 
Words: well, ok, impartial, fair, windy

Ex Output:

windy