void print(node * p)
{ if (p == NULL)
    return;
  cout << "(";
  print(p->left);
  cout << p->data;
  print(p->right);
  cout << ")"; }

void ind_print(node * p, int i)
{ if (p == NULL)
    return;
  ind_print(p->left, i + 1);
  cout << setw(i*3) << "" << p->data << "\n";
  ind_print(p->right, i + 1); }