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

int main() {
    string w,sw;
    cin >> w >> sw;
    w+=sw;
    int ans=0,b=0;
    for(int i = 0;i < 14;i++){
        if(w[i] == 'o')b++;
        else b=0;
        
        if(ans < b)ans = b;
    }
    cout << ans << endl;
return 0;
}