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: bats, pounce, cockroach, bike, fly
Example Output: bike

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

Example Input: knifer, plate, spyhole, knife, glass
Example Output:
spyhole