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.

Input: Consider Input: Category: consumer product 
Words: shop, tools, happy, service, content

Output: happy


Input: Consider Input: Category: boxing terminology 
Words: pack, level, deck, corner, jab

Output: pack


Input: Consider Input: Category: store status 
Words: not open, gated, close, shut down, touching


Output: touching