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: order office supplies, sort mail, file, program, type
Example Output: program

Example Input: Category: aesthetic characteristic 
Words: honorable, fair, variety, milky, even
Example Output: honorable

Example Input: Category: animal 
Words: dangle, flap, leap, eagle, fly
Example Output:
flap