题解 | 牛牛逆序输出

import java.util.Scanner;
public class Main {
    public static void main(String[] args)
    {
        Scanner input=new Scanner(System.in);
        String s=input.next();
        f(s);

    }
    public static void f(String s)
    {

        if(s.length()==1)
        System.out.print(s);
        else
        {
            System.out.print(s.charAt(s.length()-1));
            f(s.substring(0,s.length()-1));
        }
    }
}