// Program: extended_stack.cpp
// Author: ...

#include <iostream>
#include <ostream>
#include <cassert>

namespace ifmp {
  
  // [your code]
  
} // end namespace


int main ()
{
  ifmp::extended_stack stack1;
  
  // Input
  std::cout << "Input numbers: ";
  int n;
  while (std::cin >> n)
    stack1.push(n);
  
  // Computation and output
  
  // operator==
  ifmp::extended_stack stack2 = stack1;
  std::cout << "stack == copy ? " << (stack1 == stack2) << "\n";
  stack2.pop();
  std::cout << "stack == modified ? " << (stack1 == stack2) << "\n";
  
  // size
  std::cout << "size ? " << stack1.size() << "\n";
  std::cout << "size modified ? " << stack2.size() << "\n";
  
  return 0;
}