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: geese, crouch, duck, elephant, mallet
Example Output: crouch

Example Input: geese, sprint, duck, bow, swim
Example Output:
geese