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: air, fire, hire, ban, promote
Example Output: air

Example Input: war, brandy, bridge, gin, blackjack
Example Output: brandy

Example Input: dodge, bend, dog, hike, duck
Example Output:
dog