class Program
{
    static string[] extractedwords;
    static string[] words;
    static int margin;
    static int n;
    static int k;
    static void Main(string[] args)
    {
        words = new string[4] { "coffee", "white", "blue", "chocolate"};
        Console.WriteLine("Dati n:");
        margin = int.Parse(Console.ReadLine());
        GenerateWords(1);
    }
    static void GenerateWords(int n)
    {
        if (n == margin)
        {
            return;
        }
        for (int a = 0; a < n; a++)
        {
            for (int c = 0; c < words.Length; c++)
            {
                extractedwords[a] = words[c];
                PrintWords(extractedwords);
            }
            GenerateWords(n + 1);
        }
    }
    static void PrintWords(string[] words)
    {
        for (int n = 0; n < words.Length; n++)
        {
            if (words[n] == null)
            {
                return;
            }
            Console.Write("{0} ", words[n]);
        }
        Console.WriteLine();
    }
}