#include <bitset>
#include <string>
using namespace std;
 
 
class BinNumberHandler
{
public:
   static std::string                        addBinNumber( const std::string& first, const std::string& second );
   static std::string                        subtractBinNumber( const std::string& first, const std::string& second );
   static std::string                        multyBinNumber( const std::string& first, const std::string& second );
   static std::string                        divideBinNumber( const std::string& first, const std::string& second );
 
   static std::string                        toBinPreview( const int number);
   static int                                toDecPreview( const std::string& bin );
 
};
 
int main() {}

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