题解 | #单组_字符串#

import java.util.Scanner;

// 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) {
        Scanner scanner = new Scanner(System.in);
        int n = scanner.nextInt();
        scanner.nextLine(); // 消耗掉上一行输入后的换行符
        String s = scanner.nextLine();
        StringBuilder reversed = new StringBuilder();
        for (int i = s.length() - 1; i >= 0; i--) {
            reversed.append(s.charAt(i));
        }
        System.out.println(reversed.toString());
        scanner.close();
    }
}