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: penalty, fine, money, arrest, alright
Example Output: alright

Example Input: Category: police punishment 
Words: classy, probation, custody, fine, flyaway
Example Output: classy

Example Input: Category: activity 
Words: blow, waste away, fritter, dally, croquet
Example Output:
croquet