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: police punishment 
Words: hearing, firstrate, alert, custody, fine
Example Output: alert

Example Input: Category: shady activities 
Words: banned, replace, smear, chocolate cake, fudge
Example Output: chocolate cake

Example Input: Category: consumer product 
Words: specialty, books, ecstatic, file, content
Example Output:
ecstatic