#include <iostream>
int main() {
	std::string* C = new std::string[14];
	for (int i = 0; i < 14; i++) {
		std::cin >> C[i];
	}
	int count = 0;
	int MaxCount = 0;
	for (int i = 0; i < 14; i++) {
		if (C[i] == "o") {
			count++;
		}
		if (C[i] == "x") {
			if (count >= MaxCount)MaxCount = count;
			count = 0;
		}
	}
	if (count >= MaxCount)MaxCount = count;
	std::cout << MaxCount << std::endl;
	return 0;
}