#include <iostream>
using namespace std;

_Event E1 {};
_Event E2 {};
_Event E3 {};
_Event E4 {};
_Event E5 {};
_Event E6 {};
_Event E7 {};
_Event E8 {};
_Event E9 {};

int main() { // B1
    cout << "> B1" << endl;
    try { // B2
	cout << "> B2" << endl;
	try { // B3
	    cout << "> B3" << endl;
	    try { // B4
		cout << "> B4" << endl;
		{ // B5
		    cout << "> B5" << endl;
		    try { // B6
			cout << "> B6" << endl;
			throw E5();
			cout << "< B6" << endl;
		    } // B6
		    catch( E7 ) {
			cout << "B6: E7 handler" << endl;
		    } catch( E8 ) {
			cout << "B6: E8 handler" << endl;
		    } catch( E9 ) {
			cout << "B6: E9 handler" << endl;
		    } // C1-C3
		    cout << "< B5" << endl;
		} // B5
		cout << "< B4" << endl;
	    } // B4
	    catch( E4 ) {
		cout << "B4: E4 handler" << endl;
	    } catch( E5 ) {
		cout << "B4: E5 handler reraising" << endl;
		throw;
		cout << "B4: E5 handler after reraise" << endl;
	    } catch( E6 ) {
		cout << "B4: E6 handler" << endl;
	    } // C4-C6
	    cout << "< B3" << endl;
	} // B3
	catch( E3 ) {
	    cout << "B3: E3 handler" << endl;
	} // C7
	cout << "< B2" << endl;
    } // B2
    catch( E5 ) {
	cout << "B2: E5 handler" << endl;
    } catch( E2 ) {
	cout << "B2: E2 handler" << endl;
    } // C8-C9
    cout << "< B1" << endl;
} // B1