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: chocolate food 
Words: fudge, chocolate cake, pudding, unwarranted, heavy
Example Output: unwarranted

Example Input: Category: physical activity 
Words: sprint, cow, duck, jog, squat
Example Output: cow

Example Input: Category: police punishment 
Words: ok, money, custody, penalty, fine
Example Output:
ok