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: aesthetic characteristic 
Words: high quality, fine, attractive, alright, level
Example Output: alright

Example Input: Category: secretary duty 
Words: file, software, schedule, support, order office supplies
Example Output: software

Example Input: Category: emotional status 
Words: down, kind, ashamed, sliding, unhappy
Example Output:
sliding