#include <iostream>
#include <string>
#include <algorithm>
 
int main() {
    const std::string s1 { "f9c02b6c9da8943feaea4966ba7417d65de2fe7e" };
    std::string s2       { "........................................" };
    std::string s3       { "........................................" };
    
    std::copy(begin(s1) + 10, begin(s1) + 15, begin(s2) + 10);
    std::cout << s2 << std::endl;
    
    std::copy_backward(begin(s1) + 10, begin(s1) + 15, begin(s3) + 10);
    std::cout << s3 << std::endl;
}