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: outdoor sport activity 
Words: dog, swim, hike, hiking, fish

Ex Output:
dog


Ex Input:
Category: chocolate food 
Words: rich, molasses, fudge, brownies, wrongful

Ex Output:
wrongful


Ex Input:
Category: physical property 
Words: calcium, large, fat, ugly, angular momentum

Ex Output:

calcium