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: boats 
Words: hull, deck, rudder, check, lifeline
Example Output: check

Example Input: Category: police punishment 
Words: fine, prime, firstrate, comfortable, ticket
Example Output: comfortable

Example Input: Category: shady activities 
Words: banned, fix, fudge, unlicensed, rich
Example Output:
rich