#include <iostream>
#include <string>

using namespace std;

int main() {
    string line;
    int holiday = 0;
    int maxHoliday = 0;
    for (; getline(cin, line); ) {
        for (int i = 0; i < line.size(); i++) {
            if (line[i] == 'o') {
                maxHoliday = max(maxHoliday, ++holiday);
            } else {
                holiday = 0;
            }
        }
    }
    cout << maxHoliday << endl;
    return 0;
}