using System;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        IZour zour = new Zour();

​

        zour.Echo(value: "kek");

    }

}

​

interface IZour

{

    void Echo(string value);

}

​

class Zour : IZour

{

    public void Echo(string val)

    {

        Console.WriteLine(val);

    }

}