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

int main() {
	vector<char> v(14);
	for (int i = 0; i < 14; i++) {
		cin >> v.at(i);
	}

	vector<int> c(14);
	for (int i = 0; i < 14; i++) {
		if (v.at(i) == 'o') {
			int j = i;
			while (v.at(j) == 'o') {
				c.at(i)++;
				if (j == 13) {
					break;
				}
				else {
					j++;
				}
			}
		}
	}

	sort(c.begin(), c.end());
	cout << c.at(13) << endl;
}