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: deck, board, corner, knockout, fight
Example Output: board

Example Input: replace, ice, fire, ban, hire
Example Output: ice

Example Input: club, open-faced, picnic, blt, submarine
Example Output:
picnic