using System;

using System.Linq;

using System.Collections.Generic;

public class Program

{

    public static void Main()

    {

        string[] imgs = new string[15]{"1","2","3","4","5","6","7","8","9","10","11","12","13","14","15"};

        Random random = new Random();

        List<string> listNumbers = new List<string>();

        listNumbers.AddRange(imgs.OrderBy(i => random.Next()).Take(7));

        foreach(var item in listNumbers)

        {

            Console.WriteLine(item);

        }

        Console.WriteLine("----------------------------------------------------");

        for (int i = 0; i < imgs.Length / 2; i++)

        {

            Console.WriteLine(imgs[random.Next(imgs.Length)]);

        }

    }

}