#include <bits/stdc++.h>
using namespace std;
typedef long long ll;
const double EPS = 1e-9;
typedef vector<int> vint;
typedef pair<int, int> pint;
#define rep(i, n) REP(i, 0, n)
#define ALL(v) v.begin() , v.end()
#define REP(i, x, n) for(int i = x; i < n; i++)


int main(){
    string s, t; cin >> s >> t; s = s + t;
    int cnt = 0, maxi = 0;
    rep(i, s.size()){
        if(s[i] == 'o') cnt++;
        if(s[i] == 'x') cnt = 0;
        maxi = max(cnt, maxi);
    }
    cout << maxi << endl;
}