Hello. If you are new to Dynamo, a great thing to check out first would be the Dynamo Primer. It will help you get started on making graphs.
The first step you would probably want to do would be to get all the sheets. Once you have all the sheets, you can filter if the name/number contains what you want, in this case “ABC”. Something like this:
As @PauLtus said, it really depends on what your naming convention will actually be. This is the easiest case scenario.