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: direction 
Words: up, descending, down, lower, melancholy

Ex Output:
melancholy


Ex Input:
Category: animal 
Words: bus, leap, spider, run, fly

Ex Output:
bus


Ex Input:
Category: emotional status 
Words: well, content, pretty, detached, fine

Ex Output:

pretty