#include<stack>
using namespace std;
stack<char> sts;
void main()
{
char i,temp;
for(i=65;i<70;i++)
sts.push(i);//進棧
cout<<i<<" ";
}
cout<<endl;
temp=sts.top();//取棧頂元素
sts.pop();//出棧
cout<<temp<<" ";