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: chunky, fat, calcium, carbs, iron
Example Output: chunky

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

Example Input: recruit, burn, fire, promote, let go
Example Output:
burn