题解 | #数字颠倒#

import java.util.*;

public class Main{
    public static void toOut(int num){
        List<Integer> intNum = new ArrayList<>();
        while(num>0){
            intNum.add((num%10));
            num /= 10;
        }
        for(int data:intNum){
            System.out.print(data);
        }
    }
    public static void main(String[] args){
        Scanner in = new Scanner(System.in);
        int num = in.nextInt();
        toOut(num);
    }
}