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: duck, cat, stoop, swan, goose
Example Output: stoop

Example Input: deck, check, joker, board, bridge
Example Output: bridge

Example Input: replace, wrongful, banned, chocolate, fudge
Example Output:
chocolate