using System;

public class Kata
{
  public static string Rot13(string input)
  {
    string output = "";
    for (int i = 0; i < input.Length; i++)
    {

      if (input[i] == 'a')  // Likelz to be the absolute worst way of doing this on this planet.
      output += "n";
      else if (input[i] == 'b')
      output += "o";
      else if (input[i] == 'c')
      output += "p";
      else if (input[i] == 'd')
      output += "q";
      else if (input[i] == 'e')
      output += "r";
      else if (input[i] == 'f')
      output += "s";
      else if (input[i] == 'g')
      output += "t";
      else if (input[i] == 'h')
      output += "u";
      else if (input[i] == 'i')
      output += "v";
      else if (input[i] == 'j')
      output += "w";
      else if (input[i] == 'k')
      output += "x";
      else if (input[i] == 'l')
      output += "y";
      else if (input[i] == 'm')
      output += "z";
      else if (input[i] == 'n')
      output += "a";
      else if (input[i] == 'o')
      output += "b";
      else if (input[i] == 'p')
      output += "c";
      else if (input[i] == 'q')
      output += "d";
      else if (input[i] == 'r')
      output += "e";
      else if (input[i] == 's')
      output += "f";
      else if (input[i] == 't')
      output += "g";
      else if (input[i] == 'u')
      output += "h";
      else if (input[i] == 'v')
      output += "i";
      else if (input[i] == 'w')
      output += "j";
      else if (input[i] == 'x')
      output += "k";
      else if (input[i] == 'y')
      output += "l";
      else if (input[i] == 'z')
      output += "m";
      else if (input[i] == 'A')
      output += "N";
      else if (input[i] == 'B')
      output += "O";
      else if (input[i] == 'C')
      output += "P";
      else if (input[i] == 'D')
      output += "Q";
      else if (input[i] == 'E')
      output += "R";
      else if (input[i] == 'F')
      output += "S";
      else if (input[i] == 'G')
      output += "T";
      else if (input[i] == 'H')
      output += "U";
      else if (input[i] == 'I')
      output += "V";
      else if (input[i] == 'J')
      output += "W";
      else if (input[i] == 'K')
      output += "X";
      else if (input[i] == 'L')
      output += "Y";
      else if (input[i] == 'M')
      output += "Z";
      else if (input[i] == 'N')
      output += "A";
      else if (input[i] == 'O')
      output += "B";
      else if (input[i] == 'P')
      output += "C";
      else if (input[i] == 'Q')
      output += "D";
      else if (input[i] == 'R')
      output += "E";
      else if (input[i] == 'S')
      output += "F";
      else if (input[i] == 'T')
      output += "G";
      else if (input[i] == 'U')
      output += "H";
      else if (input[i] == 'V')
      output += "I";
      else if (input[i] == 'W')
      output += "J";
      else if (input[i] == 'X')
      output += "K";
      else if (input[i] == 'Y')
      output += "L";
      else if (input[i] == 'Z')
      output += "M";
      else
      output += input[i];

    }
    return output;
  }
}