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: level, smooth, flat, lined, elevation
Example Output: level

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

Example Input: beautiful, detailed, neat, ok, fine
Example Output:
ok