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: moral characteristic 
Words: decent, impartial, light, fair, dishonest
Example Output: light

Example Input: Category: social gathering 
Words: clan, roll, outing, club, group
Example Output:
roll