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: fat, angular momentum, ugly, capacitance, fiber

Output: fiber


Input: Consider Input: Category: activity 
Words: divide, croquet, fritter, squander, spend

Output: croquet


Input: Consider Input: Category: direction 
Words: ground, down, forward, unhappy, flat


Output: unhappy