using System;

using System.Collections.Generic;

using System.Linq;

using System.Collections;

public class Program

{

    public static void Main()

    {

        Dictionary<string,string> src = new Dictionary<string,string>();

        src.Add("A","1");

        src.Add("B","2");

        Dictionary<string,string> dst = new Dictionary<string,string>(src);

        dst["A"] = "changed";

        Console.WriteLine(src["A"]);

        Console.WriteLine(dst["A"]);

    }

}