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: ounce, foot, kilometer, milimeter, heel
Example Output: heel

Example Input: deck, stern, apron, blocking, caution
Example Output: stern

Example Input: knive, lead, spyhole, plastic, glass
Example Output:
knive