import java.io.*;

public class CopyBytes {
  public static void main(String[] args) throws IOException {

    String filename = "lena.png";

    try (FileInputStream in = new FileInputStream(filename);
      FileOutputStream out = new FileOutputStream("__"+filename)) {
      
      int c;

      while ((c = in.read()) != -1) {
        out.write(c);
      }
    } 
  }
}