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: deck, crew, fight, knockout, tko
Example Output: crew

Example Input: fret, notes, emotional state, bored, emotional upsets
Example Output: notes

Example Input: classy, fine, neat, hot, mad
Example Output:
mad