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: cool, trustworthy, milky, fair, well
Example Output: trustworthy

Example Input: Category: computers 
Words: ram, file, prepare, keys, format
Example Output: prepare

Example Input: Category: mode of transportation 
Words: jog, fly, grasshopper, bus, swim
Example Output:
grasshopper