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using System;
class Program
{
static string Caesar(string value, int shift)
{
char[] feld = value.ToCharArray();
for (int i = 0; i < feld.Length; i++)
{
char letter = feld[i];
letter = (char)(letter + shift);
if (letter > 'z')
{
letter = (char)(letter - 26);
}
else if (letter < 'a')
{
letter = (char)(letter + 26);
}
feld[i] = letter;
}
return new string(feld);
}
static void Main()
{
string a = "Hallo Welt";
string b = Caesar(a, 18);
Console.WriteLine(a);
Console.WriteLine(b);
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