#include<bits/stdc++.h>
using namespace std;
int main(){
    string str;
    for(int i=0;i<2;i++){
        string s;cin>>s;str+=s;
    }

    int ma=0;

    int cur=0;

    while(cur<str.size()){
        int cnt=0;
        while(cur<str.size()&&str[cur]=='o')cur++,cnt++;
        ma=max(ma,cnt);
        while(cur<str.size()&&str[cur]=='x')cur++;
    }

    cout<<ma<<endl;
}