Write a grading program that incorporates the following functionalities, where the user specifies which functionality they want to use from the input$)$ statement. Make the sure program will continue to run until the user specifies they want to exit the program.Functionality $1$: calculate summary statistics for the grades of each assignment $($average$,$ range, max, min$)$ and output this data to the user using a print$)$ statement.Functionality $2$: allow the user to add another assignment to the grades dictionary, and add the student name$/$grade key value pairs.