ROT13 (rotate by 13 places) is a simple letter substitution cipher that is an instance...

ROT13 (rotate by 13 places) is a simple letter substitution cipher that is an instance of a Caesar cipher developed in ancient Rome and used by Julius Caesar who used it in his private correspondence. ROT13 replaces a letter with the letter 13 letters after it in the alphabet. The following table demonstrates the translation in ROT13:

Thus, the translation of the word JULIUS using ROT13 would be WHYVHF. Write a C++ program that inputs a letter and outputs the corresponding letter using the ROT13 encoding scheme above. Your output should look like G -> T.