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: regular, general, captain, ubiquitous, popular
Example Output: captain

Example Input: rudder, bow, pack, crew, deck
Example Output: pack

Example Input: south, disgusted, down, miserable, melancholy
Example Output:
south