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: probation, suspension, jail, fine, attractive
Example Output: attractive

Example Input: Category: animal 
Words: pounce, fly, swim, walk, walk
Example Output: walk

Example Input: Category: activity 
Words: seperate, misuse, fritter, pie, divide
Example Output:
pie