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: assured, refreshing, unruffled, cool, positive
Example Output: refreshing

Example Input: Category: weather 
Words: fair, sunny, stormy, make the grade, variety
Example Output: variety

Example Input: Category: guitar part 
Words: concerned, fret, chord, fingerpick, jack
Example Output:
concerned