// No.203 ゴールデン・ウィーク(1)
// https://yukicoder.me/problems/no/203
//
#include <iostream>
#include <vector>
using namespace std;

int solve(vector<char> &calendar);


int main() {
    vector<char> calendar(14);
    for (auto i = 0; i < 14; i++)
        cin >> calendar[i];

    int ans = solve(calendar);
    cout << ans << endl;
}

int solve(vector<char> &calendar) {
    int longest_holiday = 0;
    int holiday = 0;
    for (auto c: calendar) {
        if (c == 'o') {
            holiday++;
            longest_holiday = max(longest_holiday, holiday);
        } else {
            holiday = 0;
        }
    }
    return longest_holiday;
}