#include <algorithm>
#include <iostream>

using namespace std;

int main(int argc, const char* argv[])
{
	string s1, s2;
	cin >> s1 >> s2;
	string s   = s1 + s2;
	int maxCnt = 0;
	int cnt	= 0;
	for (auto&& c : s) {
		if (c == 'o') {
			cnt++;
		}
		else {
			maxCnt = max(maxCnt, cnt);
			cnt	= 0;
		}
	}
	maxCnt = max(maxCnt, cnt);
	cout << maxCnt << endl;
	return 0;
}