using System;

using System.Text;

public class Program

{

    public static void Main()

    {

        string text = "em esrever";

        string reversedText = ReverseText(text);

        Console.WriteLine(reversedText);        

    }

    public static string ReverseText(string str)

    {

        StringBuilder sb = new StringBuilder();

        for(int i = str.Length - 1; i >= 0; i--)

        {

            sb.Append(str[i]);

        }

        return sb.ToString();

    }

}