Write a program that will prompt the user to enter a uppercase letter. On the next line, display the lowercase letter entered. If no uppercase letter is entered, display “INVALID”. The Execution should look like this:

Enter a Uppercase letter: B
Lowercase: b
[esc key terminates the program]

Enter a Uppercase letter: b
Lowercase: Invalid
[esc key terminates the program]

i need help so bad..

would you please help me with this..