For this lab assignment, you're going to make a program to help out a teacher. For this assignment, you should create a program that allows the user to enter in as many "grades" as they would like and add them to a list. When they're done entering grades, they should be able to enter $"$S$"$ to stop. Then, in order to successfully complete this assignment, you must do the following:

Print the highest grade in the list

Print the lowest grade in the list

Print the range of grades in the list $($highest minus lowest$)$

Print the average of the grades in the list

Separate your program into different functions where appropriate

Follow the other best practices we've discussed thus far