#include <string>
#include <iostream>
using namespace std;

int main()
{
    string a, b;
    cin>>a>>b;
    a+=b;
    a="x"+a+"x";
    int res=0;
    for(int i=1;i<=a.size();++i)
        if (a.find(string(i, 'o'))!=a.npos) res=i;
    cout<<res<<endl;
}