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: emotional status 
Words: downward, unhappy, down, shameful, disgusted

Ex Output:
downward


Ex Input:
Category: physical property 
Words: large, obese, fat, chunky, fiber

Ex Output:
fiber


Ex Input:
Category: guitar part 
Words: chord, fret, frustrated, strap lock, pick

Ex Output:

frustrated