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: sad, remorseful, down, ashamed, sliding

Ex Output:
sliding


Ex Input:
Category: corporate 
Words: unyielding, firm, streamline, llc, private

Ex Output:
unyielding


Ex Input:
Category: bird 
Words: sandpiper, derrick, hoist, crane, dump truck

Ex Output:

dump truck