#include <bits/stdc++.h>
using namespace std;
using ll = long long;

int m, a;

int main()
{
    string s, t;
    cin >> s >> t;
    s = s + t;
    for (auto n : s)
    {
        a = max(a, m + (n == 'o'));
        if (n == 'x')
            m = 0;
        else
            m++;
    }
    cout << a << endl;
}