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: aesthetic characteristic 
Words: 70, variety, color, fair, light
Example Output: 70

Example Input: Category: physical property 
Words: fat, area, ugly, capacitance, calcium
Example Output: calcium

Example Input: Category: aesthetic characteristic 
Words: bright, high quality, comfortable, dull, fine
Example Output:
comfortable