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: boats 
Words: head, hull, knockout, deck, dock

Output: knockout


Input: Consider Input: Category: physical property 
Words: protein, pasty, fat, thin, angular momentum

Output: protein


Input: Consider Input: Category: police punishment 
Words: there, fine, prison, money, jail time


Output: there