#include <bits/stdc++.h>
using namespace std;

int main()
{
    string s, t, week;
    cin >> s >> t;
    week = s + t;
    
    if( week[ 12 ] == 'o' ) week += 'x';
    
    vector< int > holiday;
    int length = 0;
    
    for( auto&& i : week ) {
        if( i == 'x' ) {
            holiday.push_back( length );
            length = 0;
        }
        else {
            length++;
        }
    }
    
    cout << *max_element( begin( holiday ), end( holiday ) ) << endl;
}