#include<iostream>
#include<string>

#define REP(i,n) for(i=0; i<n; i++)

using namespace std;

int main()
{
    string s,s2;
    cin>>s>>s2;
    s+=s2;
    int i,max=0,holiday=0;
    REP(i,s.length()) {
        if(s[i]=='o') { holiday++; }
        else if(s[i]!='o') { holiday=0; }
        if(max<=holiday) { max=holiday; }
    }
    cout << max << endl;
    return 0;
}