using System;

public class Program

{

    public static void Main()

    {

        Console.WriteLine("Hello World");

    }

}

​

interface IWalkable

{

    void Walk();

}

​

class People : IWalkable

{

    public void Walk()

    {

        Console.WriteLine("walk slowly");

    }

}

​

class Dog : IWalkable

{

    public void Walk()

    {

        Console.WriteLine("walk quickly");

    }

}