static void Main()
{
Pudle p = new Pudle();
p.name = "푸들이";
p.jitda(); p.work();
Jindo j = new Jindo();
j.name = "진돌이";
j.jitda();
j.run();
}
static void Main()
{
Dog p = new Pudle();
p.name = "푸들이";
p.jitda(); // 푸들푸들
((Pudle)p).work();
Dog j = new Jindo();
j.name = "진돌이";
j.jitda(); // 진돌진돌
((Jindo)j).run();
}