#include <algorithm>
#include <iostream>
#include <iomanip>
#include <string>

int main()
{
  std::string s = "ein Beispiel";
  std::cout << s << '\n';

  std::partial_sort(begin(s), begin(s)+5, end(s));

  std::cout << s << '\n'
            << "     ^ davor sortiert\n";
}