com.javarush.test.level19.lesson05.task03

import java.io.BufferedReader;
import java.io.BufferedWriter;
import java.io.FileReader;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStreamReader;

public class Solution {
  public static void main(String[] args) throws IOException {
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
    BufferedReader reader = new BufferedReader(new FileReader(br.readLine()));
    BufferedWriter writer = new BufferedWriter(new FileWriter(br.readLine(), true));

    String[] str;
    String line;

    while ((line = reader.readLine()) != null){
      str = line.split(" ");

      for (String tmp : str){
        if (isNumeric(tmp)){
          String strToWrite = tmp + " ";
          writer.write(strToWrite);
        }
      }
    }

    br.close();
    reader.close();
    writer.close();
  }

  public static boolean isNumeric(String str)
  {
    try
    {
      double d = Double.parseDouble(str);
    }
    catch(NumberFormatException nfe)
    {
      return false;
    }
    return true;
  }
}