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.

Input: Consider Input: Category: physical property 
Words: thin, brittleness, heavy, angular momentum, fat

Output: heavy


Input: Consider Input: Category: type of sandwich 
Words: clan, lettuce, bacon, club, submarine

Output: clan


Input: Consider Input: Category: construction 
Words: steam roller, digger, winch, ostrich, crane


Output: ostrich