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: neck, strap lock, fret, angry, notes
Example Output: angry

Example Input: Category: police punishment 
Words: jail, fine, bright, arrest, flyaway
Example Output: bright

Example Input: Category: aesthetic characteristic 
Words: fine, level, well, beautiful, high quality
Example Output:
well