public static void PrintMixedText(string fout, List<string> wordsFirstFile, List<string> wordsSecondFile)
        {
            int indexFirst = 0,
                indexSecond = 0;
            using(var writer = File.CreateText(fout))
            {
                string conditionWord = wordsSecondFile[indexSecond];
                StringBuilder line = new StringBuilder();

                while(indexFirst < wordsFirstFile.Count - 1 && indexSecond < wordsSecondFile.Count - 1)
                {
                    while (wordsFirstFile[indexFirst] != conditionWord && indexFirst < wordsFirstFile.Count - 1)
                    {
                        line.Append(wordsFirstFile[indexFirst]);
                        line.Append(" ");
                        indexFirst++;
                    }
                    if (wordsFirstFile[indexFirst] == conditionWord)
                    {
                        if (indexFirst < wordsFirstFile.Count - 1)
                        {
                            conditionWord = wordsFirstFile[indexFirst + 1];
                        }
                        else//last word in file matched condition word
                        {
                            for (int i = indexSecond; i < wordsSecondFile.Count - 1; i++)
                            {
                                line.Append(wordsSecondFile[i]);
                                indexSecond++;
                            }
                            line.Append(wordsFirstFile[indexFirst]); //last word
                                                                     //PABAIGA!!!!!!!! EXIT CIA KAZKAIP
                            indexFirst = wordsFirstFile.Count;
                            indexSecond = wordsSecondFile.Count;
                        }
                    }
                    else
                    {
                        for(int i = indexSecond; i < wordsSecondFile.Count - 1; i++)
                        {
                            line.Append(wordsSecondFile[i]);
                            line.Append(" ");
                        }
                        indexFirst = wordsFirstFile.Count;
                        indexSecond = wordsSecondFile.Count;
                    }

                    while (wordsSecondFile[indexSecond] != conditionWord && indexSecond < wordsSecondFile.Count - 1)
                    {
                        line.Append(wordsSecondFile[indexSecond]);
                        line.Append(" ");
                        indexSecond++;
                    }
                    if (wordsSecondFile[indexSecond] == conditionWord)
                    {
                        if (indexSecond < wordsSecondFile.Count - 1)
                        {
                            conditionWord = wordsSecondFile[indexSecond + 1];
                        }
                        else
                        {
                            for (int i = indexFirst; i < wordsFirstFile.Count - 1; i++)
                            {
                                line.Append(wordsFirstFile[i]);
                                //indexFirst++;
                            }
                            line.Append(wordsSecondFile[indexSecond]);
                            //PABAIGA
                            indexFirst = wordsFirstFile.Count;
                            indexSecond = wordsSecondFile.Count;
                        }
                    }
                    else
                    {
                        for (int i = indexFirst; i < wordsFirstFile.Count - 1; i++)
                        {
                            line.Append(wordsFirstFile[i]);
                            line.Append(" ");
                        }
                        indexFirst = wordsFirstFile.Count;
                        indexSecond = wordsSecondFile.Count;
                    }
                }


                writer.WriteLine(line.ToString());
            }
        }