题解 | #23年OPPO-a的翻转#

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 = Integer.toString(a);
        int length = s.length();

        String tmp = "";
        for (int i = length - 1; i >= 0; i--) {
            tmp += s.charAt(i);
        }

        long b = Long.parseLong(tmp);
        System.out.println(a + b);
    }
}