#include <algorithm>
#include <iterator>
#include <iostream>
#include <string>

int main()
{
  std::string s = "Hallo Welt";
  std::string t;
  std::cout << s << '\n';

  std::reverse_copy(begin(s), end(s), std::back_inserter(t));

  std::cout << t << '\n';
}