#include <iostream>
#include <list>
#include <algorithm>
#include <numeric>
using namespace std;
int main ()
{
list<
int> l(10);
iota(l.begin(),l.end(),1);
copy(l.begin(),l.end(),
ostream_iterator<
int>(cout," "));
cout << endl;
l.reverse();
copy(l.begin(),l.end(),
ostream_iterator<
int>(cout," "));
cout << endl;
return 0;
}