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

Example Input: Category: computers 
Words: prepare, space, file, image, ram
Example Output: prepare

Example Input: Category: alcoholic drinks 
Words: vodka, gin, tequila, brandy, slapjack
Example Output:
slapjack