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: poker 
Words: board, joker, deck, fold, apron
Example Output: apron

Example Input: Category: computers 
Words: hardware, sort mail, download, program, file
Example Output: sort mail

Example Input: Category: chocolate food 
Words: brownie, unlicensed, fudge, chocolate, cookies
Example Output:
unlicensed