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: order office supplies, file, errands, prepare, motherboard
Example Output: motherboard

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

Example Input: impartial, fair, just, tone, unprejudiced
Example Output:
tone