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: boxing terminology 
Words: corner, fold, deck, knockout, level

Ex Output:
fold


Ex Input:
Category: guitar part 
Words: frustrated, amp, string, fret, headstock

Ex Output:
frustrated


Ex Input:
Category: direction 
Words: backward, emotionalities, south, down, left

Ex Output:

emotionalities