Custom Number Format - Automatically Enter Dashes At Appropriate Spot

I am needing a custom format for the following. I need a cell entry to be 1 letter, three numbers, a dash, 5 numbers, a dash, two numbers, a dash, and then two number. Example: A109-54785-13-00. The first letter will almost always be an "A."

To further complicate the matter, the entry is copied from an email and pasted without the dashes. In the above example, the number in the email would read, "A109547851300." I copy it from the email and paste it in the proper cell in the worksheet. I would like the custom format to automatically enter the dashes at the appropriate spot.

If it was all numbers, this would be easy. I created a custom format for the numbers, but when the A is included, Excel no longer treats it as a number and the custom format did not work.

Is this possible in Excel (without VBA).

I could use the custom number format I created and then later go back and add the "A" at the beginning, but that is as much work as manually adding the dashes.