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: weather 
Words: cold, 70, fair, well, luke
Example Output: well

Example Input: Category: aesthetic characteristic 
Words: level, fair, milky, sunny, well
Example Output: sunny

Example Input: Category: weather 
Words: just, fair, warm, luke, deal
Example Output:
just