$1.$ Your program should request a grade from the user.

a$.$ If the grade is invalid, repeat your request to the user.

$2.$ Append the grade and its numerically equivalent value to two lists defined in your program.

$3.$ Calculate the GPA based on all of the grades that have been input in this session of the program.

$4.$ Print two lines of response to the user:

a$.`$Your grades are: $\_\_\_\_\_\_`($include the grades that have been input$)$

b$.`$Your GPA is $\_\_\_\_\_\_`($include the calculated GPA with no rounding$)$

$5.$ Ask if the user would like to $($C$)$ continue or $($X$)$ exit

a$.$ If they want to continue, start back at step #$1$

b$.$ If they want to exit, terminate the program

c$.$ If they respond with unexpected input, repeatedly ask if they would like to continue or exit

Hints

Remember the importance of variable scope. Your program should not include any "global" variables. Any information needed by a functio