Create a C++ program that will input a single letter and printout the corresponding digit on the telephone. The digits and letters on the telephone are associated as follows: 2 = ABC 3 = DEF 4 = GHI 5...

Create a C++ program that will input a single letter and printout the corresponding digit on the telephone. The digits and letters on the telephone are associated as follows:
2 = ABC
3 = DEF
4 = GHI
5 = JKL
6 = MNO
7 = PRS
8= TUV
9=WXY
There is no digit corresponding to either Q or Z. for this letters your program should print a message indicating that they do not exist on the telephone dial. The program should use CONDITIONAL if STATEMENT accept either uppercase or lowercase.