#include<iostream>
#include<string>
#include<algorithm>
#include<cctype>
#include<set>
#include<bitset>
#include<math.h>
#include<map>
#include<queue>
#include<iomanip>
using namespace std;

int main(){
    string s, t;
    cin >> s >> t;
    s += t;
    int cnt = 0, max1 = 0;
    for (int i = 0; i < 14; i++){
        if (s[i] == 'o') cnt += 1;
        if (s[i] == 'x' || i == 13){
            max1 = max(max1, cnt);
            cnt = 0;
        }
    }
    cout << max1 << endl;
}