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: goose, cow, bend, lion, duck
Example Output: bend

Example Input: descending, remorseful, down, right, ground
Example Output: remorseful

Example Input: current, data sets, main, sea, wave
Example Output:
data sets