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: submarine, burger, bar, lettuce, club
Example Output: bar

Example Input: Category: moral characteristic 
Words: frank, concise, bun, matter of fact, fortitude
Example Output: bun

Example Input: Category: chocolate food 
Words: heavy, wrongful, cake, brownies, fudge
Example Output:
wrongful