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, hero, club, discothek, hamburger
Example Output: discothek

Example Input: Category: corporate 
Words: unyielding, concerted, firm, combined, united
Example Output: unyielding

Example Input: Category: emotional status 
Words: loveful, down, emotional, backward, emotionalities
Example Output:
backward