#include "iostream"
using namespace std;

char letter[15];
int ans = 0;
int box = 0;

int main() {
	cin >> letter;
	for (int i = 0; i < 14; i++) {
		if (letter[i] == 'o')box++;
		else box = 0;
		if (box > ans)ans = box;
	}
	cout << ans << "\n";
}