Implement a python script that does the following:
1. Prompts the user to select two folder paths.
2. I want the folder selection prompt to be a single dialogue box that the user selects the folders using a GUI.
2. After the user selects the input and output folder paths, save each as predefined global variables.
3. Iterate through the input folder and output to a csv named 'blurbs.csv' the file name, md5, and the first 50 characters of text inside each file.
4. Enable the script to read the following file types: doc, docx, pdf, txt, eml, ppt, pptx, xls, and xlsx files. Provide two versions of response separated with exactly 6 asterisk symbols: ******.
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