class InnerSubclass {
  public static void main(String[] args) {
      C c = new C(1);
      for (int i = 1; i<10;i++){
          c = c.new D(i);
      }
      System.out.println("Tataaa: " + c);  
  } }

class C{
  int i;
  C(int i){this.i = i;}
  public String toString(){
      return "i is: " + i +"; ";
  }
      
  class D extends C {
      int i;
      public String toString(){
        return "i is: " + i +"; " + C.this.toString();
      }
      D(int i){ super(i+1); this.i = i;}
  }
}