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: unyielding, concerted, firm, combined, united
Example Output: unyielding

Example Input: gunwale, stern, deck, box, bow
Example Output: box

Example Input: convention, outing, doorstep, clan, club
Example Output:
doorstep