```cpp #include <string> #include <iostream> #include <iomanip> int main() { std::string a; std::cin >> a; auto n = a.length(); a = std::string(n * 2 % 3, '0') + a; n = a.length(); std::cout << std::oct; for (auto i = 0llu; i < n; i += 3) { std::cout << std::stoi(a.substr(i, 3), nullptr, 16); if (i == 0llu) std::cout << std::setw(4) << std::setfill('0'); } std::cout << std::endl; return 0; } ```