Write c++ program

Write a program that prompts the user to enter two upper case letters such that the first letter is alphabetically before the second letter. The program validates the two letters and prints the number of letters between the two entered upper case letters. The program ask the user if s(he) wants to try again? See sample input/output below: Sample Input/Output: Enter the first upper case letter: 7 Enter the first upper case letter: d Enter the first upper case letter: c Enter the second upper case letter>C: F The number of letters betueen C and F is 4 Do you uant to try again? Y or y for yes, N or n for no: + Invalid letter, enter Y, y, N, or n: U Invalid letter, enter Y, y, N, or n: y Enter the first upper case letter: I Enter the second upper case letter > I: x The number of letters between I and X is 16 Do you want to try again Y or y for yes, N or n for no: n