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.

Example Input: Category: direction 
Words: up, down, sliding, shameful, right
Example Output: shameful

Example Input: Category: shady activities 
Words: cookies, wrongful, fudge, smuggled, smear
Example Output: cookies

Example Input: Category: computers 
Words: firewall, file, errands, folder, program
Example Output:
errands