#include<list>
#include<iostream>
using namespace std;
void main()
{
list<int>l1;
l1.push_back(5);
l1.push_back(34);
l1.push_back(1);

list<int>::iterator il=l1.begin();
l1.insert(il,6);
l1.erase(il);

while(l1.size()>0)
{
int value = l1.front();
cout<<value<<endl;
l1.pop_front();
}
}