using System;
using System.IO;
public class KtoD1 {
 public static void Main() {
  string str;
  StreamWriter fstr_out;
  // Open the file directly using StreamWriter.
  try {
   fstr_out = new StreamWriter(\"test.txt\");
  }
  catch(IOException exc) {
   Console.WriteLine(exc.Message + \"Cannot open file.\");
   return ;
  }
  Console.WriteLine(\"Enter text (\'stop\' to quit).\");
  do {
   Console.Write(\": \");
   str = Console.ReadLine();
   if(str != \"stop\") {
    str = str + \"\\r\\n\"; // add newline
    try {
     fstr_out.Write(str);
    } catch(IOException exc) {
     Console.WriteLine(exc.Message + \"File Error\");
     return ;
    }
   }
  } while(str != \"stop\");
  fstr_out.Close();
 }
}