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: fire, cool, water, ban, ice
Example Output: ban

Example Input: well, honorable, sunny, fair, dishonest
Example Output: sunny

Example Input: flaxen, well, size, ghostly, fair
Example Output:
well