#include
#include
#include
#include
using namespace std;
int main()
{
stack > str_stack;
string quote[3] ={"A","B","C" };
for (int i =0; i < 3; ++i)
str_stack.push(quote[i]);
while (!str_stack.empty()) {
cout << str_stack.top();
str_stack.pop();
}
}