#include <iostream>
#include <vector>
#include <deque>
#include <stack>
#include <memory>
#include <functional>
#include <algorithm>
#include <map>
#include <list>
#include <complex>
#include <string>
#include <cstdio>
#include <cstring>
#include <cstdlib>
#include <cmath>
#include <numeric>
#include <array>
using namespace std;
typedef std::pair<int, int> pii;
typedef long long int ll;

#define pb push_back

int main(){

	const int n = 14;

	char cc;
	int count = 0;
	int result = 0;
	for (int i = 0; i < n; ++i) {
		cin >> cc;
		if(cc == 'o'){
			count++;
		}else{
			count = 0;
		}
		result = max(result, count);
	}

	std::cout << result << std::endl;

	return 0;
}