Name a Movie Clip instance with a number/ numeric character

Sometimes you may recieve a flash file that contains several movie clips named with numbers. and you may want to extend this file by adding your own movie clips.
To do that, movie clips must be named with numbers (i.e. change '' textbox with a number in the movie clip parameters), but the Flash Professional CS3 software does not you enter a number. It displays " '1' is not a valid instance name. Please enter an identifier that begins with an alphabetic character or other supported symbol.".As the existing movie clip instances are named with numbers, you think you should be able to do the same.
Any ideas on how to solve this issue?


Well there is a simple solution to this, you can open the same file in Flash 8 and name the instances there, as this issue is only with Flash CS 3.