Help with File Lists in Google Documents

Hello- I am trying to collaboratively write a report with some friends using Google Drive. We have decided to make each chapter a separate Google Doc file. I would like the chapters to be listed numerically; such as, A1, A2...A10, A11. However, this method does not seem to be working because Google Drive will list the files like A1, A10, A11, A2.

Is there a different naming scheme that will fix this? Thank you for your help! =D