$1$ Hinclude $($stdio$.$ h$)$

$2$ using namespace std;

$3$eclass AC

$45$

$6$ class $B!$

$7.$

$3^4$

$9$ class $C$ bublic A$,$ public $B$ C

$19$

$1$;

$11$

$12$

$13$ int main $()$

$15$

$16$

$17$

in

Anturn as