算法训练 字符串逆序

import java.util.Scanner;
public class Main {

    public static void main(String[] args) {
        // TODO Auto-generated method stub
        Scanner sc=new Scanner(System.in);
        String s=sc.nextLine();
        char a[]=s.toCharArray();
        for(int i=a.length-1;i>=0;i--){
            System.out.print(a[i]);
        }

    }

}