题解 | #数字颠倒#

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 sc = new Scanner(System.in);
        long num = sc.nextLong();
        char[] charArray = Long.toString(num).toCharArray();
        for (int i = charArray.length - 1; i >= 0; i--) {
            System.out.print(charArray[i]);
        }
    }
}