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: tough, taut, rough, amalgamated, firm

Ex Output:
amalgamated


Ex Input:
Category: weather 
Words: honorable, fair, stormy, sunny, endure

Ex Output:
honorable


Ex Input:
Category: police punishment 
Words: exquisite, custody, fine, prison, money

Ex Output:

exquisite