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

int main()
{
	string S1, S2, C;
	cin >> S1 >> S2;
	C = S1 + S2;

	int ans = 0, cnt = 0, n = C.length();
	int i = 0;
	while (i < n)
	{
		while (i < n && C[i] == 'o')
		{
			cnt++;
			i++;
		}
		ans = max(ans, cnt);
		cnt = 0;
		i++;
	}

	cout << ans << endl;
}