题解 | #数字颠倒#

import java.util.Scanner;

import java.util.*;
import java.io.*;

// 注意类名必须为 Main, 不要有任何 package xxx 信息
public class Main {
    public static void main(String[] args) throws IOException{
       BufferedReader bf =new BufferedReader(new InputStreamReader(System.in));
        String str;
        HashSet<Character> hs=new HashSet<>();
        while ((str=bf.readLine())!=null){
            StringBuilder sb=new StringBuilder();
            System.out.println(sb.append(str).reverse().toString());
        }
    }
}