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: heron, davit, egret, derrick, crane
Example Output: davit

Example Input: deck, dock, galley, joker, hull
Example Output: joker

Example Input: taut, hard, concerted, tough, firm
Example Output:
concerted