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: horizontal, hotel, flat, lined, smooth

Ex Output:
hotel


Ex Input:
Category: emotional status 
Words: angry, joyful, tools, fearful, content

Ex Output:
tools


Ex Input:
Category: aesthetic characteristic 
Words: fair, mild, medium, even, flaxen

Ex Output:

mild