import java.io.*;
import java.util.logging.Filter;

public class Main {

    public static void main(String[] args) throws IOException{
            InputStream in = new FileInputStream("izvor.txt");
             BufferedInputStream bis = new BufferedInputStream(in);
            OutputStream out = new FileOutputStream("destinacija.txt");
             BufferedOutputStream bos = new BufferedOutputStream(out);

             BufferedReader bf = new BufferedReader(new InputStreamReader(bis));

             while(bf.ready()) {
                 String s = bf.readLine();
                 if(s.charAt(0) >= '0' && s.charAt(0) <= '9') {
                     bos.write(s.getBytes());
                     bos.write(10);
                 }
             }
            bos.flush();
             bis.close();
             bos.close();

        }

    }