#include <string>
#include <iostream>
#include <iterator>
#include <boost/regex.hpp>

const boost::regex e("\\A(\\d{3,4})[- ]?(\\d{4})[- ]?(\\d{4})[- ]?(\\d{4})\\z");
const std::string machine_format("\\1\\2\\3\\4");
const std::string human_format("\\1-\\2-\\3-\\4");

std::string machine_readable_card_number(const std::string& s)
{
	std::string result = regex_merge(s, e, machine_format, boost::match_default | boost::format_sed | boost::format_no_copy);
	return result;
}

std::string human_readable_card_number(const std::string& s)
{
	std::string result = regex_merge(s, e, human_format, boost::match_default | boost::format_sed | boost::format_no_copy);
	return result;
}

bool validate_card_format(const std::string& s) 
{ 
   return regex_match(s, e); 
}

int main(int argc, char * argv[])
{
	std::string input;
	while(1)
	{
		std::cout<<"input a credit card number: ";
		std::cin>>input;
			
		if(validate_card_format(input))
		{
			std::cout<<"machine readable card number: "<<machine_readable_card_number(input)<<std::endl;
			std::cout<<"human readable card number: "<<human_readable_card_number(input)<<std::endl;
		}
		else
		{
			std::cout<<"not a validate credit card number"<<std::endl;
		}
		
	}
	return 0;
}