#include <iostream>
#include <list>
using namespace std;

int main() {
    list<int> l1;
    l1.push_front(1);
    l1.push_front(2);
    l1.push_front(3);
    l1.push_back(4);
    l1.push_back(5);

    for(list<int>::iterator it = l1.begin(); it != l1.end(); it++) {
        cout << *it << endl;
    }
    return 0;
}