#include <bits/stdc++.h>
#define rep(i, n) for (int i = 0; i < n; ++i)
using ll = long long;
using namespace std;
const int INF = 1e9;

int main() {
    string s, t;
    cin >> s >> t;
    s += t;

    int ans = 0, cnt = 0;
    rep(i, s.size()) {
        if (s[i] == 'o')
            ++cnt;
        else
            ans = max(ans, cnt), cnt = 0;
    }

    cout << max(ans, cnt) << endl;

    return 0;
}