Class Task 56#

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

namespace ConsoleApplication1
{
    class Program
    {
        static string WierdFlip(string st)
        {
            string st2 = "";
            for (int i = 0; i < st.Length - 1; i += 2)
            {
                st2 += st[i + 1];
                st2 += st[i];
            }
            return st2;
        }
        static void Main(string[] args)
        {
            string st = Console.ReadLine();
            Console.Write(WierdFlip(st));
            Console.ReadLine();
        }
    }
}