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 n = in.nextInt();
        String str = n + "";
        char[] chars = str.toCharArray();
        for(int i = chars.length - 1; i >= 0; i--){
            System.out.print(chars[i]);
        }
    }
}