import java.util.regex.*;
import java.util.*;
import java.io.*;
import java.text.*;
import java.time.*;
import java.time.format.DateTimeFormatter;;

public class Main {



  public static void main(String[] args) throws Exception{



      String daty = "2007-01-12Jakis txt2008-01-31 xxx 2008-02-29 2008-15-10 2008-19-45 2009-05-01\\n 20999-11-11 pppp 2001-00-01 09-01-01 2001-01-00 2009-01-111 2009-02-29 1998-11-11";

      String regex = "(?<year>1[0-9][0-9][0-9]|2[0-9][0-9][0-9]|3[0-9][0-9][0-9]|4[0-9][0-9][0-9]|5[0-9][0-9][0-9]|6[0-9][0-9][0-9]|7[0-9][0-9][0-9]|8[0-9][0-9][0-9]|9[0-9][0-9][0-9])"
                    + "-?(?<month>1[0-2]|0[1-9])"
                    + "-?(?<day>3[01]|0[1-9]|[12][0-9])(?!\\d+)";

      Pattern pattern = Pattern.compile(regex);

      Matcher matcher = pattern.matcher(daty);

      String result = "";


      while(matcher.find()) {
          result += matcher.group() + '\n';
      }
      if (result.contentEquals(""))result = "Brak danych";



      System.out.print(result);
  }

}