What is the difference in total sales volume between the highest-selling and second-highest-selling regions…

What is the difference in total sales volume between the highest-selling and second-highest-selling regions…: a task in SmolDataEnvs-harbor-train-sandbox: 📊 SmolDataEnvs: Harbor (train) (Harbor dataset). Files (in /home/user/input, no subfolders): - vgsales.csv