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.

Input: Consider Input: Category: physical activity 
Words: bend, jog, get down, duck, pig

Output: pig


Input: Consider Input: Category: police punishment 
Words: wispy, fine, probation, calm, prime

Output: calm


Input: Consider Input: Category: bird 
Words: parrot, crane, derrick, goose, steam roller


Output: steam roller