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: open-faced, team, roll, doorstep, club
Example Output: team

Example Input: Category: computers 
Words: ram, file, motherboard, organize, folder
Example Output: organize

Example Input: Category: social gathering 
Words: convention, club, discothek, hamburger, dance hall
Example Output:
hamburger