Here is a way I used to count blocks in acad LT
First you must create a template in a txt file.
You write the following:
After that you save the file and go to acad. In the command line you write attext, you choose a file format( cdf for example), you select the objects( you can select the whole drawing), choose the template file and the output file.
The result will look like this
You can add some attributes if you want too.
Hope this is helpfull.