#include <iostream>
#include <string>
using namespace std;
int main()
{
	int n = 0, m = 0;
	string w1, w2, comb;
	cin >> w1 >> w2;
	comb = w1 + w2;
	for (int i = 0; i < 14; i++)
	{
		if (comb[i] == 'o') n++;
		else
		{
			if (m < n) m = n;
			n = 0;
		}
	}
	if (n >= m) m = n;

	cout << m << endl;
	return 0;
}