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: guitar part 
Words: fret, worried, chord, notes, headstock

Output: worried


Input: Consider Input: Category: moral characteristic 
Words: frank, concise, bun, matter of fact, fortitude

Output: bun


Input: Consider Input: Category: consumer product 
Words: content, disappointed, specialty, shop, books


Output: disappointed