#include <iostream>

#include <stack>

using namespace std;

​

int main() {

  // Create a stack of strings called cars

  stack<string> cars;

​

  // Add elements to the stack

  cars.push("Volvo");

  cars.push("BMW");

  cars.push("Ford");

  cars.push("Mazda");

  // Get the size of the stack

  cout << cars.size();

  return 0;

}

​