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: fire, cool, water, ban, ice
Example Output: ban

Example Input: fair, unprejudiced, impartial, honorable, variety
Example Output: variety

Example Input: funny, ethical, cool, hot, optimist
Example Output:
hot