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: solid, sustainability, streamline, firm, private

Ex Output:
solid


Ex Input:
Category: aesthetic characteristic 
Words: variety, fair, alright, pale, flaxen

Ex Output:
alright


Ex Input:
Category: chocolate food 
Words: rich, tart, cake, replace, fudge

Ex Output:

replace