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: consumer product 
Words: joyful, program, activity, food, content

Ex Output:
joyful


Ex Input:
Category: boxing terminology 
Words: ring, lifeline, jab, deck, knockout

Ex Output:
lifeline


Ex Input:
Category: guitar part 
Words: fret, notes, emotional upsets, output cord, truss rod

Ex Output:

emotional upsets