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: ring, deck, blind, cards, joker
Example Output: ring

Example Input: Category: physical activity 
Words: bend, duck, goose, jog, crouch
Example Output: goose

Example Input: Category: aesthetic characteristic 
Words: ok, neat, fine, attractive, beautiful
Example Output:
ok