#include <iostream>
#include <sstream>
#include <iomanip>
#include <string>
#include <vector>
 
int main()
{
 
    std::string s("13 01 09 00");
    std::vector<unsigned char> v;
    std::istringstream in(s);
    in >> std::hex;
 
    unsigned short c;
    while (in >> c) v.push_back(static_cast<unsigned char>(c));
 
    std::cout << v.size() << "\n";
    std::cout << std::boolalpha
              << (0x13 == v[0]) << "\n"
              << (0x01 == v[1]) << "\n"
              << (0x09 == v[2]) << "\n"
              << (0x00 == v[3]) << "\n";
 
    return 0; 
}
 

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