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: weather 
Words: mild, warm, fine, fair, deal
Example Output: fine

Example Input: Category: emotional status 
Words: ecstatic, excited, content, activity, angry
Example Output: activity

Example Input: Category: police punishment 
Words: arrest, fine, annoyed, ticket, flyaway
Example Output:
annoyed