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: type of rigidity 
Words: unbending, unyielding, inflexible, firm, streamline

Output: streamline


Input: Consider Input: Category: emotional status 
Words: excited, content, item, disappointed, jealous

Output: item


Input: Consider Input: Category: emotional status 
Words: truss rod, emotional state, frustrated, fret, crying


Output: truss rod