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: physical activity 
Words: bend, winter, fall, climb, exercise
Example Output: winter

Example Input: Category: secretary duty 
Words: schedule, file, answer calls, correspondence, ram
Example Output: ram

Example Input: Category: police punishment 
Words: prison, fine, jail, dull, jail time
Example Output:
dull