using System;

using System.IO;

using System.Xml;

using System.Text;

using System.Threading.Tasks;

public class Program

{

    public static void Main()

    {

        var str = new Container<string>("Hello worlkd");

        var obj = (IContainer<object>)str;;

        Console.WriteLine(obj.Value.ToString());

    }

    public interface IContainer<out T> // IContainer<T>

    {

        T Value { get; }

    }

    public class Container<T> : IContainer<T>

    {

        public Container(T @value)

        {

            this.Value = @value;

        }

        public T Value { get; set;}

    }

}