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: fair, endure, mild, color, tangle
Example Output: color

Example Input: ashamed, disgusted, emotional upsets, right, down
Example Output: right

Example Input: spyhole, knife, plastic, glass, metal
Example Output:
knife