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

Example Input: fire, instruct, inferno, retire, scold
Example Output: inferno

Example Input: knockout, corner, ring, deck, pack
Example Output:
pack