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: physical activity 
Words: stoop, crouch, bow, duck, dog

Output: dog


Input: Consider Input: Category: emotional status 
Words: firstrate, happy, fine, ok, well


Output: firstrate