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: club, hero, lettuce, bar, toast
Example Output: bar

Example Input: current, dastards, prompt, course, timely
Example Output: course

Example Input: alert, fine, relaxed, pretty, mad
Example Output:
pretty