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: luke, milky, stormy, fair, warm
Example Output: milky

Example Input: beautiful, classy, dull, comfortable, fine
Example Output: comfortable

Example Input: exquisite, dull, high quality, fine, acceptable
Example Output:
acceptable