#include<iostream>
#include<iomanip>
#include<cmath>
#include<string>
#include<algorithm>
#include<vector>
#include<math.h>

using namespace std;
int main(){
    string C1, C2, C;
    cin >> C1;
    cin >> C2;
    int cnt = 0, cntV = 0;
    C = C1 + C2;
    for(int i = 0; i < C.size(); i++){
        if(C[i] == 'o'){
            cnt++;
        }
        if(C[i] =='x'){
            cntV = max(cntV, cnt);
            cnt = 0;
        }
        cntV = max(cntV, cnt);
    }
    cout << cntV << endl;
    return 0;
    }