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: consumer product 
Words: merchandise, happy, thing, content, service
Example Output: happy

Example Input: Category: aesthetic characteristic 
Words: there, ticket, fine, dull, level
Example Output: ticket

Example Input: Category: aesthetic characteristic 
Words: jail, neat, fine, classy, attractive
Example Output:
jail