static void Main(string[] args)
        {
            List<string> words = new List<string>();
            List<string> results = new List<string>();
            var n = Int32.Parse(Console.ReadLine());
            char charChain = 'a';

            for (int i = 0; i < n; i++)
            {
                var word = Console.ReadLine().ToLower();
                words.Add(word);
            }

            string last = words.Last();
            foreach (string s in words)
            {
                var word = s.ToArray();
                List<string> iterationList = new List<string>();
                iterationList.Add(s);
                char chainLink = word[word.Length - 1];

                Console.WriteLine("in the chain of " + s + ": ");
                foreach (string s1 in words)
                {
                    Console.WriteLine("Chainlink is " + chainLink + " in beginning and word is " + s1);
                    var word1 = s1.ToArray();
                    if (chainLink == word1[0] && !iterationList.Contains(s1) )
                    {
                        iterationList.Add(s1);
                        chainLink = word1[word1.Length - 1];
                        Console.WriteLine(s1 + " added and chainlink is " + chainLink);

                    }
                }

                //foreach (string blabla in iterationList)
                //{
                //    Console.WriteLine("The list of " + iterationList[0] + " is: " + blabla);
                //}

                if ( iterationList.Count() > results.Count() )
                {
                    results = iterationList;
                }
            }
            //results = results.Distinct().ToList();
            if (results.Count() > 1)
            {
                Console.WriteLine(results.Count());
                foreach (string result in results)
                {
                    Console.WriteLine(result);
                }
            } else
            {
                Console.WriteLine(0);
            }
            Console.ReadKey();
        }