namespace StringReverse     //  
{                           //
 public class Program      //
 {                         //
   static void Main()      //
   {
     ///*----------------------- console_settings ------------------------*///
     const int cWidth = 53;                     //  console width
     const int cHeight = 30;                    //  & height
     Console.SetWindowSize(cWidth, cHeight);    //
     Console.OutputEncoding = Encoding.UTF8;    //  Unicode Symbols

     /*----------------------------- VARIABLES -----------------------------*/
     string userInput;
     int index,
         lenght = 0;
     /*-------------------------------- HEAD -------------------------------*/
     Console.Clear();
     Console.Write("\n                  Reverse String                     " +
     /* cWidth: */ "\n=====================================================");

     /*---[in:]-------------------- PROMPT_USER ----------------------------*/
     Console.Write("\n Geben Sie einen Text ein.");    //  

     /*----------------------------- GET_INPUT -----------------------------*/
     userInput = Console.ReadLine();              //  get input + [enter]
                                                  //
     foreach (char letter in userInput)
     { lenght++; }
     Console.Write($"\n Länge:{lenght}\n\n");

     char[] charsInput = new char[lenght];

     for (int i = 0; i < lenght; i++)
     {
       char letter = userInput[i];
       charsInput[i] = letter;
     }

     /*---[out:]--------------------- SOLUTION -----------------------------*/
     index = lenght - 1;
     do
     {
       Console.Write($"{charsInput[index]}");
       index--;
     } while (index >= 0);

     /*-------------------------------- END --------------------------------*/
     Console.Write("\n Zum beenden Eingabetaste drücken..");
     Console.ReadLine();    //  wait for [enter]
     Console.Clear();       //
   }
 }
}