#include <iostream>
#include <string>
#include <vector>

using namespace std;

class Stack : public vector<string>
{
public:
    Stack() {}

    void push(string item);
    string pop();
};

void Stack::push(string item)
{
    this->push_back(item);
}

string Stack::pop()
{
    string top_item = this->back();
    this->pop_back();
    return top_item;
}

int main()
{
    Stack stk;

    stk.push("A");
    stk.push("B");
    stk.push("C");

    stk.erase(stk.begin() + 1);  // remove "B"
    for (string str : stk) cout << str << endl;
}