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: personal characteristic 
Words: cold, positive, calm, assured, cool
Example Output: cold

Example Input: Category: type of sandwich 
Words: hoagie, burger, hamburger, club, discothek
Example Output: discothek

Example Input: Category: guitar part 
Words: pick, fret, amp, bored, neck
Example Output:
bored