ACM.Easy.Main C# (CSharp) Метод

    static void Main(string[] args)
    {
      string plain = "abcdefghijklmnopqrstuvwxyz";
      string cipher = "ZYXWVUTSRQPONMLKJIHGFEDCBA".ToLower();

      Console.Write("Enter phrase: ");

      string input = Console.ReadLine().ToLower();
      string conversion = "";

      for (int i = 0; i < input.Length; i++)
      {
        int index = plain.IndexOf(input[i]);
        conversion += cipher[index];
      }

      Console.WriteLine(conversion);

      // keep console open
      Console.ReadLine();
    }
  }