#include <string>
#include <vector>
using namespace std;
int main() {
string s("101010100000000011111111");
const size_t n = s.length() / 8;
vector<uint8_t> a(n);
for(size_t block = 0; block < n; block++)
{
uint8_t acc = 0;
const size_t start = block * 8;
for(size_t offset = start; offset < start + 8; offset++)
{
acc = (acc << 1) + (s[offset] - '0');
}
a[block] = acc;
}
for(size_t j = 0; j < n; j++)
printf("%02X", a[j]);
}