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: animal 
Words: bus, leap, spider, run, fly

Ex Output:
bus


Ex Input:
Category: direction 
Words: below, backward, melancholy, down, ground

Ex Output:
melancholy


Ex Input:
Category: aesthetic characteristic 
Words: honorable, fair, variety, tone, flaxen

Ex Output:

honorable