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: moral characteristic 
Words: precise, grub, frank, stern, honesty
Example Output: grub

Example Input: Category: poker 
Words: board, joker, deck, fold, apron
Example Output: apron

Example Input: Category: secretary duty 
Words: file, organize, schedule appointments, answer calls, program
Example Output:
program