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: goat, iguana, raft, hamster, fish
Example Output: raft

Example Input: fish, bat, mice, dog, hiking
Example Output: hiking

Example Input: fair, mild, loyal, alright, trustworthy
Example Output:
mild