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

using namespace std;

int main()
{
    string c, s;
    cin >> c >> s;

    c += s;
    int ans = 0, hol = 0;
    for(int i=0; i<14; i++){
        if(c[i] == 'x') hol = 0;
        else hol++;
        ans = max(ans, hol);
    }

    cout << ans << endl;

    return 0;
}