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: computers 
Words: hardware, sort mail, download, program, file
Example Output: sort mail

Example Input: Category: emotional status 
Words: descending, disgusted, down, miserable, emotional
Example Output: descending

Example Input: Category: animal 
Words: iguana, bat, climbing, dog, fish
Example Output:
climbing