#include <iostream>
#include <vector>
#include <algorithm>
#include <string>

#define REP(i, a, b) for (int i = int(a); i < int(b); i++)

using namespace std;

typedef long long int lli;

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