#include <algorithm>
#include <iostream>
#include <string>
 
int main()
{
  std::string s = "abcddddefgh";
 
  std::cout << s << '\n'
            << "   "    << lower_bound(begin(s), end(s), 'd') << '\n';
            << "   ^^^" << upper_bound(begin(s), end(s), 'd') << '\n';
}