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: fret, worried, chord, notes, headstock
Example Output: worried

Example Input: impartial, fair, honorable, level, fine
Example Output: level

Example Input: duck, squat, crouch, pig, hike
Example Output:
pig