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.

Example Input: Category: secretary duty 
Words: errands, fax, file, type, ram
Example Output: ram

Example Input: Category: personal characteristic 
Words: freezing, calm, positive, cool, popular
Example Output: freezing

Example Input: Category: animal 
Words: drive, jump, grasshopper, fly, eagle
Example Output:
drive