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: mild, cold, level, stormy, fair
Example Output: level

Example Input: down, kind, ashamed, sliding, unhappy
Example Output: sliding

Example Input: fearful, content, thing, specialty, program
Example Output:
fearful