#include<iostream>
#include<vector>
#include<algorithm>
#include<cstdio>
using namespace std;
int main(){
    int count=0,ans=0;
    string s1,s2;
    cin >> s1 >> s2;
    for(int i=0;i<7;i++){
        if(s1[i]=='o')  count++;
        else{
            ans = max(ans,count);
            count=0;
        }
    }
    for(int i=0;i<7;i++){
        if(s2[i]=='o')  count++;
        else{
            ans = max(ans,count);
            count=0;
        }
    }
    ans = max(ans,count);
    cout << ans;
    return 0;
}