Note: Please help me create the program in C++. Be sure to complete everything as a whole. Thank you.

-The first three letters in your last name (all lowercase)

-The first three letters in your first name (all uppercase)

-Three invalid characters

(Phone key pads) The international standard letterumber mapping found on the telephone is shown below: abc def 7 pqrs Write a program that prompts the user to enter a letter and displays its corresponding number. Enter a letter: Enter + is an invalid input Enter a letter: asnter The corresponding number is 2 Enter a letter: A Enter The corresponding number is 2