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: well, windy, even, fair, level
Example Output: windy

Example Input: Category: physical activity 
Words: sprint, cow, duck, jog, squat
Example Output: cow

Example Input: Category: secretary duty 
Words: space, schedule, errands, file, organize
Example Output:
space