#include <iostream>
#include <string>
#include <cassert>

using namespace std;

// include definition of the ArrayOfStrings struct here

int main()
{
  ArrayOfStrings vs;
  init(vs);

  while (true)
  { cout << "--------------------------\n";
    string s;
    cin >> s;

    if (s == "pop")
      pop_back(vs);
    else
      push_back(vs, s);

    for (int i = 0; i < size(vs); i += 1)
      cout << i << ": " << access(vs, i) << "\n";
  }
}