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#include <iostream>
#include <string>


uint64_t add_digits(const char first, const char second) {
	return uint64_t(first -'0') + uint64_t(second - '0');
}

uint64_t count_pairs(const std::string &first, const std::string &second, const std::string &third) {
	if (first.size() != second.size() || first.size() != third.size()) {
		return 0;
	}
	//std::cerr << first << "\n" << second << "\n" << third <<"\n";
	uint64_t result = 0;
	bool continuation = false;
	bool exceed = false;
	for (int32_t i = first.size() - 1; i >=0; --i) {
		uint64_t added =  add_digits(first[i], second[i]);
		uint64_t third_val = uint64_t(third[i] - '0');
		bool third_equal = (added % 10 == third_val);
		bool third_equal_ex = (added % 10 == third_val - 1) && (continuation && exceed);
		if (continuation && third_equal) {
			result += 1;
	//		std::cerr << i << " first condition\n";
		}
		if (third_equal) {
			result += 1;
	//		std::cerr << i << " second condition\n";
		}
		exceed = (added >= 10);
		continuation = third_equal || third_equal_ex;
	}
	return result;
}

void prog_main(std::istream& in, std::ostream& out)
{
	std::string first, second, third;
	
	in >> first >> second >> third;


	out << count_pairs(first, second, third) ;

}

#ifndef TEST
int main(int argc, char* argv[])
{
	prog_main(std::cin, std::cout);
	return 0;
}
#endif