Create a Python script that generates the content of two files, which should be different. In the first file, the system will contain lines that start with A- followed by a count up to 100. The second file should contain lines that start with B- and also contain a count up to 100. For example: File one A-0 A-1 A-2 ... A-100 File two B-0 B-1 B-2 ... B-100 After the two files are saved, you will then read them back into the script and merge the contents of the files into a third file, which will alternate lines from the first at the second file.