#include<iostream>
#include<algorithm>
#include<string>
using namespace std;
int main()
{
	string s;
	string s2;
	int count = 0;
	int max_day = 0;
	cin >> s >> s2;
	for (int i = 0; i < 7; i++){
		if (s[i] == 'o'){
			count++;
		}
		else{
			max_day = max(max_day, count);
			count = 0;
		}
	}
	for (int i = 0; i < 7; i++){
		if (s2[i] == 'o'){
			count++;
		}
		else{
			max_day = max(max_day, count);
			count = 0;
		}
	}
	max_day = max(max_day, count);
	cout << max_day << endl;
}