This will do that with what looks like an additional space in front of all the values:
SELECT DISTINCT chr(160) & Format([RDCNum],"@@@@") ...
and
UNION SELECT "
" FROM Reminders
and you might need to change the Order by line to :
ORDER BY 1
That's ORDER BY column 1, in case you did it know you can do that. Character 160 is a hard space.