#include <iostream>
using namespace std;
int main(){
    string a,b;cin>>a>>b;
    string c = a+b;
    int ans = 0;
    int tmp = 0;
    for(int i = 0; c.size() > i; i++){
        if(c[i] == 'o'){
            tmp++;
        }else{
            ans = max(ans,tmp);
            tmp = 0;
        }
    }
    cout << max(ans,tmp) << endl;
}