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: location (proximity) 
Words: near, close, gated, bordering, on top of
Example Output: gated

Example Input: Category: activity 
Words: blow, waste away, sweet roll, whittle, fritter
Example Output: sweet roll

Example Input: Category: physical activity 
Words: fall, dodge, swim, duck, sheep
Example Output:
sheep