using System;

public class Program

{

    public static void Main()

    {

        int num = 123;

        string str = num.ToString();

        char[] newStr = new char[str.Length];

        for(int i = 0; i < str.Length; i++)

        {

            newStr[str.Length - 1 - i] = str[i];

        }

        Console.WriteLine(newStr);

    }

}