题解 | #字符逆序#

import java.io.*;

// 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) throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));

        String str;
        while((str = br.readLine()) != null){
            for (int i = str.length() - 1;i >= 0;i--){
                System.out.print(str.charAt(i));
            }
        }
    }
}