using System;

public class Program

{

    public static void Main()

    {

        I obji=new A();

        A obja=new A();

        obji.HelloWorld();

        obja.HelloWorld();

    }

    interface I

    {

     void HelloWorld();

    }

    class A:I

    {

     void I.HelloWorld()

    {

    Console.WriteLine("Hello World from interface");

    }

    public     void HelloWorld()

    {

    Console.WriteLine("Hello World class");

    }

    }

}