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

namespace 按數字的相反順序輸出
{
    class Program
    {
        static void Main(string[] args)
        {
            string count = "";
            Console.WriteLine("輸入一個正整數");
            string str = Console.ReadLine();
            for (int i = 0; i < str.Length; i++)
            {
                count = count + str[str.Length - i - 1];    //利用字串的長度-i，還要減1，因為從0開始
               // Console.WriteLine(count);
                //Console.WriteLine(str[str.Length-i-1]); 
            }
            Console.WriteLine(count);
            Console.ReadKey();
        }
    }
}