题解 | #字符串反转#

import java.io.*;

public class Main {

public static void main(String [] args) throws Exception{
    BufferedReader bf = new BufferedReader(new InputStreamReader(System.in));
    char [] arr =bf.readLine().toCharArray();
    
    StringBuilder sb = new StringBuilder();
    for(int i = arr.length-1; i>=0; i--){
        sb.append(arr[i]);
    }
    System.out.println(sb.toString());
    
}

}