using System;

using System.Linq;

​

public class Lotto {

  readonly Random rnd = new Random();

  const int MAX_NUMBERS = 6;

  const int MAX_VALUE = 53;

  public int[] Run() {

    var ret = new int[MAX_NUMBERS];

    var nums = Enumerable.Range(1, MAX_VALUE).ToList();

    for (int i = 0; i < ret.Length; i++) {

      var idx = rnd.Next(0, nums.Count());

      ret[i] = nums[idx];

      nums.RemoveAt(idx);

    }

    return ret;

  }

  public static void Output(int[] numbers) 

      => Console.WriteLine($"{string.Join(".\n", numbers)},");

  public static void Main() => Output(new Lotto().Run());

}