using System;

public class Program

{

    public static void Main()

    {

        new Printer().Print(new Contain());

    }

}

​

public interface IFirst{

    string First{get;set;}

}

public interface ISecond{

    string Second{get;set;}

}

public class Contain : IFirst, ISecond{

    public string First{get{return "I AM FIRST";} set{}}

    public string Second{get{return "I AM SECOND";} set{}}

}

public class Printer{

    public void Print(IFirst first){

        Console.WriteLine(first.First); 

    }

    public void Print(ISecond second){

        Console.WriteLine(second.Second);

    }

}