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: animal 
Words: waggle, drive, fly, bee, dive
Example Output: drive

Example Input: Category: physical activity 
Words: bend, jog, get down, duck, pig
Example Output: pig

Example Input: Category: weather 
Words: sunny, alright, deal, fair, tangle
Example Output:
alright