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: guitar part 
Words: fret, concerned, jack, notes, amp

Ex Output:
concerned


Ex Input:
Category: chocolate food 
Words: rich, chocolate, fudge, chocolate cake, unwarranted

Ex Output:
unwarranted


Ex Input:
Category: corporate 
Words: firm, llc, rigged, common, concerted

Ex Output:

rigged