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: guitar part 
Words: inlays, concerned, string, notes, fret
Example Output: concerned

Example Input: Category: personal characteristic 
Words: cool, calm, warm, persistent, level
Example Output: warm

Example Input: Category: moral characteristic 
Words: light, fine, fair, balanced, dishonest
Example Output:
light

