!759

abstract sclass Ref {
  abstract S getID();
}

sclass Node extends Ref {
  S id = randomID(12);
  S name;
  
  S getID() {
    ret id;
  }
  
  toString {
    ret id + " - " + or2(name, "?");
  }
}

p {
  print(new Node);
  print(new Node);
}