What will happen if the Greek letter names were exhausted for naming tropical storms?

The traditional list of hurricane names for the year goes from A to W, and, in the very rare occurrence that the W storm has formed and there is another tropical storm out there, then the Greek letter names (Alpha, Beta, Gamma, etc. to Omega) are used (e.g., 2005 Atlantic hurricane season). Considering the activity so far (September 2020) of the Atlantic hurricane season, and that we still have two months of season (i.e., until November 30), what is the next naming list coming from (if there even is one)?