#include <iostream>
#include <string>
using namespace std;

int main()
{
	int ans = 0, cnt = 0;
	char c = 0;
	string w1, w2;

	cin >> w1 >> w2;
	w1 += w2;

	for (int i = 0; i < w1.size(); i++) {
		if (w1[i] == 'x') continue;
		cnt = 0;
		while (i < w1.size() && w1[i] == 'o') 
			cnt++, i++;
		if (ans < cnt) ans = cnt;
	}

	cout << ans << endl;
	return 0;
}