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: boats 
Words: hull, deck, rudder, check, lifeline

Output: check


Input: Consider Input: Category: outdoor sport activity 
Words: whale, fish, raft, hiking, kayak

Output: whale


Input: Consider Input: Category: secretary duty 
Words: correspondence, schedule, answer calls, keys, file


Output: keys