题解 | #字符串反转#

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 in = new Scanner(System.in);
        String str = in.nextLine();
        char[] chars = str.toCharArray();
        StringBuilder sb = new StringBuilder();
        for(int i = chars.length - 1; i >= 0; i--) {
            sb.append(chars[i]);
        }
        System.out.print(sb.toString());
    }
}