public class Main {
  public static void main(String[] args) {
    final String title = "Roof";
    long costCents = 12990;
    boolean done = false;
    String contractor = null;
    String display = contractor == null ? "unknown" : contractor;
    System.out.println(title + ": " + costCents / 100.0 + " EUR, " + display);
    System.out.println(done);
  }
}