using System;

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            Sample3 s3 = new Sample3();
            s3.write(new Sample1());
            s3.write(new Sample2());
            s3.write(new Sample0());
        }
    }

    class Sample0
    {

    }
    class Sample1
    {
        public void write()
        {
            Console.WriteLine("1");
        }
    }

    class Sample2
    {
        public void write()
        {
            Console.WriteLine("2");
        }
    }

    class Sample3
    {
        public void write(Object x)
        {
            if (x.GetType().GetMethod("write") == null)
            {
                Console.WriteLine("Invalid argument");
            }
            else
            {
                x.GetType().InvokeMember("write", System.Reflection.BindingFlags.InvokeMethod, null, Activator.CreateInstance(x.GetType(), true), null);
            }
        }
    }
}