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: physical property 
Words: bulky, angular momentum, pasty, fat, big

Ex Output:
big


Ex Input:
Category: animal 
Words: dog, hunt, hamster, bat, fish

Ex Output:

hunt