#include <iostream>
#include <list>

using namespace std;

int main()
{
	list<int> l;
	list<int>::iterator it_l;

	l.push_back(12);
	l.push_back(22);
	l.push_front(2);
	l.push_front(5);

	for ( it_l = l.begin(); it_l != l.end(); it_l++ ) {
		cout << *it_l << endl;
	}

	return 0;
}