#include <stdio.h>
#include <algorithm>
#include <iostream>
#include <string>
#include <vector>
#include <functional>
#include <map>
#include <iomanip>
#include <math.h> 
#include <stack>
#include <queue>
#include <bitset>
#include <cstdlib>
#include <tuple>
#include <cctype>
#include <ctype.h>
#include <set>
#include <sstream>

using namespace std;


int main() {
	int i, j, k;
	string s1, s2;

	cin >> s1 >> s2;

	string s = s1 + s2;

	bool flag = false;
	int cnt = 0;
	int maxn = 0;

	for (i = 0; i < s.length(); i++) {
		if (s[i] == 'o' && flag==false) {
			flag = true;
			cnt = 1;
		}
		else if (s[i] == 'o' && flag == true) {
			flag = true;
			cnt++;
		}
		else {
			cnt = 0;
			flag = false;
		}
		maxn = max(maxn, cnt);
	}

	cout << maxn << endl;




	getchar();
	getchar();
	return 0;
}