#include <iostream>
#include <string>
#include <algorithm>
 
int main() {
    const std::string s { "abcdefghijk" };
    const auto first = std::find(std::begin(s), std::end(s), 'd');
    const auto last = std::find(std::begin(s), std::end(s), 'i');
    std::cout << std::string(first, last) << std::endl;
}