#include <iostream>
using namespace std;
 
class B {
};
 
 
class D: public B {
};
 
 
int main()
{
  D derived;
 
  try {
    throw derived;
  }
  catch(B b) {
    cout << "Caught a base class.\n";
  }
  catch(D d) {
    cout << "This won't execute.\n";
  }
 
  return 0;
}