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: moral characteristic 
Words: unprejudiced, warm, fair, ok, balanced
Example Output: warm

Example Input: Category: animal 
Words: goat, cat, fish, hamster, hunting
Example Output: hunting

Example Input: Category: secretary duty 
Words: errands, file, answer, prepare, image
Example Output:
image