#include <iostream>
#include <list>
using namespace std;
int main(void) {
	list<int> l{1,2,3,4,5};
	l.push_back(6);
	l.push_front(8);
	list<int>::iterator p;
	for (p=l.begin();p!=l.end();p++) {
		cout << *p << " ";
	}
	int sum=0;
	while (! l.empty()) {
		sum+=l.front();
		l.pop_front();

	}
	cout << "Sum=" <<sum << endl;
	return 0;


}