#include <iostream>
#include <sstream>
#include <math.h>
#include <stack>
#include <set>
#include <algorithm>
#include <string>
#include <queue>
#include <stack>
#include <map>
#include <cstdio>
#include <vector>
using namespace std;

#define INF (1 << 30)
#define INFLL (1LL << 60)

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