Given a set of five words, generate the word from the set that does not belong (i.e. is the least relevant) with the other words. Words are separated by commas.

Example Input: kind, down, sad, backward, emotionalities
Example Output: backward

Example Input: fritter, apple, divide, blueberry, danish
Example Output: divide

Example Input: jog, fly, grasshopper, bus, swim
Example Output:
grasshopper