class Q3
{
public:
	string& execute(string& left, string& right)
    {
		try
		{
			int leftVal = std::stoi(left);
			int secondVal = std::stoi(right);

			int result = leftVal + secondVal;

			string &rResult(*new string());
			rResult = std::to_string(result);

			return rResult;
		}

		catch (std::exception &ex)
		{
			string &rResult(*new string(""));
			return rResult;
		}

		catch (...)
		{
			string &rResult(*new string(""));
			return rResult;
		}
    }
};