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: bird 
Words: dump truck, pelican, goose, crane, derrick
Example Output: dump truck

Example Input: Category: emotional status 
Words: emotionalities, miserable, down, south, sad
Example Output:
south