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: frank, bold, brash, precise, pork
Example Output: pork

Example Input: fish, bat, mice, dog, hiking
Example Output: hiking

Example Input: unprejudiced, trustworthy, milky, fair, balanced
Example Output:
milky