题解 | #牛牛逆序输出#

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);
        StringBuffer a = new StringBuffer(in.next());
        System.out.println(a.reverse());
    }
}