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: geographical property 
Words: flat, horizontal, smooshed, elevation, house

Ex Output:
house


Ex Input:
Category: aesthetic characteristic 
Words: cool, trustworthy, milky, fair, well

Ex Output:
trustworthy


Ex Input:
Category: emotional status 
Words: custody, acceptable, calm, fine, well

Ex Output:

custody