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: file, keys, organize, errands, correspondence
Example Output: keys

Example Input: trustworthy, milky, fair, equitable, decent
Example Output: milky

Example Input: fix, fudge, fib, unlicensed, pudding
Example Output:
pudding