#include <sstream>
#include <iostream>
#include <iomanip>
#include <boost/multiprecision/cpp_int.hpp>
 
using u256 = boost::multiprecision::number<boost::multiprecision::cpp_int_backend<256, 256, boost::multiprecision::unsigned_magnitude, boost::multiprecision::unchecked, void>>;
 
int main() {
    std::stringstream stream;
    u256 data=0xFEDEFA;
    data <<= 128;
    for (int i = 0; i<32; ++i) {
        uint8_t dataByte = int(data & 0xFF);
        data >>= 8;
        stream << std::setfill('0') << std::setw(sizeof(char) * 2) << std::hex << int(dataByte) << "  ";
    }
    std::cout << stream.str();
}

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