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: solid, leverage, hard, unbending, firm

Ex Output:
leverage


Ex Input:
Category: guitar part 
Words: inlays, concerned, string, notes, fret

Ex Output:
concerned


Ex Input:
Category: moral characteristic 
Words: trustworthy, honorable, fair, unjust, size

Ex Output:

size