// See if there are any blank lines or leading or trailing blanks or
// embedded tabs or multiple blanks.

import java.util.*;

public class blankcheck {
  public static void main(String[] args) {
    int linenum = 0;
    Scanner in = new Scanner(System.in);
    while (in.hasNext()) {
      String line = in.nextLine();
      linenum++;
      if (line.equals(""))
        System.out.println("Line " + linenum + ": empty");
      if (!line.equals(line.trim()))
        System.out.println("Line " + linenum + ": leading/trailing blanks");
      if (line.contains("\t") || line.contains("  "))
        System.out.println("Line " + linenum + ": embedded tabs or blanks");
    }
  }
}