#include <iostream>
#include <algorithm>
#include <vector>
#include <string>
#include <iomanip>
#include <cmath>
#include <functional>
using namespace std;
#define diff(x,y) ((x > y) ? (x - y) : (y - x))
#define us(x) (x > 0) ? x : x * -1
#define lli long long int

int main() {
	int max = 0, a = 0;
	char x;
	for (int i = 0; i < 14; i++) {
		cin >> x;
		if (x == 'o')	a++;
		else			a = 0;
		if (a > max)	max = a;
	}
	cout << max << endl;
	return 0;
}