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: ice, let go, fire, sack, replace
Example Output: ice

Example Input: fair, even, milky, ghostly, luke
Example Output: luke

Example Input: cat, canoe, fish, goat, horse
Example Output:
canoe