#include<stdio.h>
#include <vector>
#include <list>
#include <map>
#include <set>
#include <queue>
#include <stack>
#include <algorithm>
#include <sstream>
#include <iostream>
#include <string>
#include <stdio.h>

using namespace std;

int main() {

	string S[2];
	cin >> S[0] >> S[1];

	char c[14];
	for (int i = 0; i < 2; i++) {
		for (int j = 0; j < 7; j++) {
			c[7 * i + j] = S[i][j];
		}
	}

	int cnt = 0, ans = 0;
	for (int i = 0; i < 14; i++) {
		if (c[i] == 'o') {
			cnt++;
			ans = max(ans, cnt);
		}
		else {
			cnt = 0;
		}
	}

	cout << ans << endl;

	return 0;
}