private static string DecodeMessage(string[] lines)
        {
            var listOfWords = new List<string>();
            var i = 0;
            string[] currentWords;
            char currentLetter;
            while (true)
            {
                currentWords = lines[i].Split(' ');
                if (currentWords[0].Contains("чао"))
                    break;
                for (var j = 0; j < currentWords.Length; j++)
                {
                    if (string.IsNullOrWhiteSpace(lines[i]))
                    {
                        break;
                    }
                    currentLetter = currentWords[j][0];
                    if (char.IsUpper(currentLetter))
                        listOfWords.Add(currentWords[j]);
                }
                i++;
            }
            listOfWords.Reverse();
            return string.Join(" ", listOfWords.ToArray());
        }