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: fearful, content, substance, program, thing
Example Output: fearful

Example Input: bow, gunwale, crew, deck, blocking
Example Output: blocking

Example Input: equitable, just, level, fine, fair
Example Output:
level