using System;

public class Program

{

    public static void Main()

    {

        string sentence = "";

            StreamWriter myFile;

            myFile = File.CreateText("test1.txt");

            do

            {

                Console.Write("Enter a text : ");

                sentence = Console.ReadLine();

                if (sentence.Length != 0)

                {

                    myFile.WriteLine(sentence);

                }

            } while (sentence.Length != 0);

            myFile.Close();

    }

}