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: aesthetic characteristic 
Words: variety, fair, alright, pale, flaxen
Example Output: alright

Example Input: Category: secretary duty 
Words: fax, program, file, make coffee, answer
Example Output: program

Example Input: Category: animal 
Words: fish, whale, kayak, stingray, horse
Example Output:
kayak