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: corporate 
Words: corporation, firm, synergy, tough, concerted

Output: tough


Input: Consider Input: Category: type of sandwich 
Words: french toast, community, club, burger, dagwood

Output: community


Input: Consider Input: Category: guitar part 
Words: neck, pick, concerned, fret, headstock


Output: concerned