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: solid, leverage, hard, unbending, firm

Output: leverage


Input: Consider Input: Category: date status 
Words: current, blue, detestings, up to the moment, history

Output: blue


Input: Consider Input: Category: moral characteristic 
Words: color, dishonest, unprejudiced, fair, unjust


Output: color