#include "iostream"
using namespace std;

int main(){
    string str1,str2;
    int mx,cnt;

    cin >> str1;
    cin >> str2;
    mx = cnt = 0;
    for (auto c : str1 + str2){
        if (c == 'o')
            cnt += 1;
        else {
            mx = max(mx,cnt);
            cnt = 0;
        }
    }
    mx = max(mx,cnt);
    cout << mx << endl;
    return 0;
}