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: current, timely, prompt, drink, do tests
Example Output: drink

Example Input: blocking, fold, deck, check, board
Example Output: blocking

Example Input: thin, brittleness, heavy, angular momentum, fat
Example Output:
heavy