题解 | #字符串反转#

import java.io.InputStreamReader;
import java.io.BufferedReader;
import java.io.IOException;

public class Main{
    public static void main(String[] args) throws IOException{
        BufferedReader reader = new BufferedReader(new InputStreamReader(System.in));
        String str = reader.readLine();
        StringBuilder sb = new StringBuilder(str);
        sb.reverse();
        System.out.println(sb.toString());
    }
}