Write a program that reads the contents of a charge account number file into a list. Each account number is a seven-digit number, such as 5658845. The program should then ask the user to enter a charge account number. The program should determine whether the number is valid by searching for it in the list. If the number is in the list, the program should display a message indicating the number is valid. If the number is not in the list, the program should display a message indicating the number is invalid.