#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;

int main() {
    string s;
    string s2;
    cin >> s >> s2;
    s += s2;
    int ans = 0;
    int tester = 0;
    for(int i = 0;i < 14;i++){
        if(s[i] == 'x')tester = 0;
        else tester++;
        
        if(ans < tester)ans = tester;
    }
    cout << ans << endl;
    return 0;
}