A2

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace GerryTutor
{
    class Program
    {
        static void Main(string[] args)
        {
            string text = Console.ReadLine();
            Stack<char> stack = new Stack<char>();
            foreach (char ch in text)
            {
                stack.Push(ch);
            }
            while (stack.Count != 0)
            {
                Console.Write(stack.Pop());
            }

        }
    }
}