题解 | #数字颠倒#

import java.util.Scanner;

// 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) {
        Scanner in = new Scanner(System.in);
        int a = in.nextInt();
        String s = String.valueOf(a);

        s = new StringBuffer(s).reverse().toString();
        System.out.println(s);
    }
}