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: corporate 
Words: unyielding, concerted, firm, combined, united

Ex Output:
unyielding


Ex Input:
Category: animal 
Words: bird, fish, fly, drive, eagle

Ex Output:
drive


Ex Input:
Category: moral characteristic 
Words: impartial, fair, brisk, honorable, decent

Ex Output:

brisk