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

int main()
{

string str1[] = {"A", "B", "C","D"};
list <string> Lstr1(str1, str1+4);
//
cout<<"\n Lstr1.size() : " << Lstr1.size() <<endl; 
list<string>:: iterator it;
 for(it= Lstr1.begin(); it !=Lstr1.end(); it++)
  {
 	 cout <<" "<< *it;
 } 
 cout<<"\n Front " << Lstr1.front();
 cout<<"\n Back " << Lstr1.back(); 
 
 return 0; 
}