#include <iostream>
 
int StrToInt(std::string);
 
int main()
{
    std::cout << StrToInt("9999XxX999") << std::endl;

    return 0;
}

int StrToInt(std::string str)
{
	int convert_str = 0;
	std::string str_n = "0123456789";

	for (int i = 0; i < str.size(); i++) {
		for (int cnt = 0; cnt < 10; cnt++)
			if (str[i] == str_n[cnt]) 
				convert_str = convert_str * 10 + cnt; continue;
	}
	if (str[0] == '-') return -convert_str;
	else return convert_str;
}