#include <deque>
#include <iostream>
#include <iterator>
using namespace std;

int main()
{
    deque<int> L;

    int value1 = -2;
    int value2 = -1;
    L.push_back (value1);
    L.push_back (value2);
    L.push_back (1);
    L.push_back (2);
    L.push_front(5);

   
    deque<int>::iterator it;

    for(it=L.begin();it < L.end();it++)
    {
            cout << *(it) << "\n\n";
    }

    cout << "\n\n" ;

    while(L.size() > 0)
    {
        cout << L.back() << "\n\n";
        L.pop_back();
     }

// output

copy(L.begin(), L.end(), ostream_iterator<int>(cout, " "));

return 0;

}