DWITE Online Computer Programming Contest, April 2010, Problem 1
ROT13 as in "rotate by " is a really simple cipher algorithm, that just advances every letter by places, wrapping around from
A. Since applying the algorithm twice would advance each letter by places, it has a really neat property that encryption and decryption are the same function.
The input will contain 5 lines, strings characters long.
The output will contain 5 lines — corresponding strings that were run through ROT13 function once.
Note: The character rotation should apply only to alphabetic characters. Spaces, digits, and punctuation should stay as is.
EBG13 FNZCYR. ROT13 SAMPLE.
ROT13 SAMPLE. EBG13 FNZCYR.