#include <iostream>
#include <cstdio>
#include <vector>
#include <algorithm>
#include <utility>
#include <string>

using namespace std;

int main() {
	string in1, in2;

	cin >> in1 >> in2;
	string gw = in1 + in2;

	int holidays = 0;
	int max_holidays = 0;
	for (int i = 0; i < gw.size(); i++) {
		if (gw[i] == 'o') {
			holidays++;
		} else {
			max_holidays = max(max_holidays, holidays);
			holidays = 0;
		}
	}
	max_holidays = max(max_holidays, holidays);
	cout << max_holidays << endl;
	return 0;
}