using System;

public class Program

{

    public static void Main()

    {

        int x = 1234567891;

        Solution a = new Solution();

        Console.WriteLine("Hello World Reverse - " + a.reverse(x));

    }

}

​

public  class Solution {

    public int reverse(int x) {

     var output = 0;

        while(x != 0){

            var pop = x % 10;

            x = x/10;

            if(output > int.MaxValue/10 || output < int.MinValue/10) return 0;

            output = output*10 + pop;           

        }

        return output;

    }

}