#define _CRT_SECURE_NO_WARNINGS

#include <iostream>
#include <string>
#include <vector>
#include <cmath>
#include <fstream>
#include <set>
#include <utility>
#include <algorithm>
#include <queue>
#include <stack>
#include <deque>
#include <numeric>
#include <sstream>
#include <list>
#include <map>
#include <stdlib.h>
#include <time.h>

#define rep(i,p,n) for(int i=(int)p;i<(int)n;i++)
#define repp(i,p,n) for(int i=(int)p;i>=(int)n;i--)
#define Sort(x) sort(x.begin(),x.end());
#define ll long long
#define INF 2000000000

using namespace std;
int main() {
	string s, ss;
	cin >> s >> ss;
	s += ss;

	int count = 0,ans=0;
	rep(i, 0, s.length()) {
		if (s[i] == 'o')count++;
		else if(s[i]=='x'){
			ans = max(ans, count);
			count = 0;
		}
	}
	ans = max(ans, count);
	cout << ans << endl;

	return 0;
}