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: mode of transportation 
Words: train, spider, wave, fly, drive

Output: spider


Input: Consider Input: Category: police punishment 
Words: suspension, arrest, classy, custody, fine

Output: classy


Input: Consider Input: Category: consumer product 
Words: joyful, program, activity, food, content


Output: joyful