#include <bits/stdc++.h>
using namespace std;
 
typedef long long ll;
typedef pair<int,int> P;
 
const int INF = 1e9;
const int mod = 1e9+7;
const double EPS = 1e-10;
const double PI = acos(-1.0);

int main()
{
    string s,t;
    cin >> s >> t;
    s += t;
    int res = 0,cnt = 0;
    for(int i = 0; i <= s.size(); i++){
        if(i == s.size() || s[i] == 'x'){
            res = max(res,cnt);
            cnt = 0;
        }else cnt++;
    }
    cout << res << endl;
    return 0;
}