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: streamline, sustainability, private, firm, stiff
Example Output: stiff

Example Input: cow, fish, dog, sea turtle, hunt
Example Output: hunt

Example Input: milky, even, fair, clime, pale
Example Output:
clime