import java.io.*;
import java.util.*;


/**
 * Simple program to show how to handle an optional input file argument.
 *
 * Read lines from either the input file named as a program argument or
 * from standard input if no file name is present.  Copy the contents of
 * the file to standard output.
 */
class OptionalFile {
  public static void main(String[] args) throws FileNotFoundException {
    InputStream in;
    if (args.length == 0) {
      in = System.in;
    } else {
      in = new FileInputStream(args[0]);
    }

    Scanner s = new Scanner(in);
    while (s.hasNextLine()) {
      System.out.println(s.nextLine());
    }
  }
}