#include <iostream>
#include <string>
#include <algorithm>
 
int main() {
    std::string s { "f9c02b6c9da8943feaea4966ba7417d65de2fe7e" };
    std::sort(begin(s), end(s));
    std::cout << s << std::endl;
    
    const auto result = binary_search(begin(s), end(s), 'a');
    std::cout << std::boolalpha << result << std::endl;
}