#include <iostream>
#include <vector>
#include <array>
#include <algorithm>
#include <cstdio>
#include <cmath>
#include <string>
using namespace std;

int main(){
	int count = 0;
	int tmp = 0;
	string date;
	while(cin >> date){
		for(int i = 0; i < date.size(); i++){
			if(date[i] == 'o') tmp++;
			else {
				count = max(count,tmp);
				tmp = 0;
			}
		}
	}
	cout << max(count,tmp) << endl;
	return 0;
}