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: wispy, fine, probation, calm, prime
Example Output: calm

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

Example Input: Category: police punishment 
Words: fine, money, arrest, alert, penalty
Example Output:
alert