using System;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        List<int> a = new List<int>() { 1, 2, 3 };

        List<int> b = new List<int>(a);

        PrintList(a);

        PrintList(b);

        a.Clear();

        PrintList(a);

        PrintList(b);

    }

    private static void PrintList(List<int> elems)

    {

        foreach(int x in elems)

        {

            Console.WriteLine(x);

        }

        Console.WriteLine(string.Empty);

    }

}