69. 有如下程序：
#include <iostream>
using namespace std;
class Base{
public:
void output() { cout<<1;}
virtual void Print(){cout<<'B';}
virtual ~Base() = default;
};
class Derived : public Base{
public:
void output() {cout<<2;}
void Print() { cout<<'D';}
};
int main(){
Base *ptr=new Derived;
ptr->output();
ptr->Print();
delete ptr;
return 0;
}
程序的输出结果是______。
