// adapted from cppref>cpp/cpp/algorithm/sample

#include <algorithm>
#include <ctime>
#include <iostream>
#include <iterator>
#include <random>
#include <string>
 
int main()
{
  std::string in = "abcdefgh", out;
  // auto rng = std::mt19937{std::random_device{}()}; 
  auto rng = std::mt19937(time(NULL)); // no truly random_device on MinGW implementation 
  std::sample(in.begin(), in.end(), std::back_inserter(out), 5, rng);
  std::cout << "five random letters out of " << in << " : " << out << '\n';
}