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();
        StringBuffer sb = new StringBuffer();
        do{
            sb.append(n%10);
            n = n/10;
        }while(n!=0);
        System.out.println(sb.toString());
    }
}