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: type of sandwich
Words: meeting, bacon, submarine, toast, club
Example Output: meeting

Example Input: Category: computers
Words: download, file, order office supplies, document, motherboard
Example Output: order office supplies

Example Input: Category: secretary duty
Words: answer calls, answer, file, firewall, support
Example Output:
firewall