#include <iostream>
#include <sstream>
#include <vector>
#include <cmath>
using namespace std;
# define M_PI 3.14159265358979323846

int main() {
    std::ios::sync_with_stdio(false);
    std::cin.tie(0);
    
    int max = 0;
    int cnt = 0;
    for(int i = 0; i < 14; i++){
    	char c;
    	cin >> c;
    	if(c == 'o'){
    		cnt++;
    	}else{
    		max = (cnt > max) ? cnt : max;
    		cnt = 0;
    	}
    }
    max = (cnt > max) ? cnt : max;
    
    cout << max << endl;
    return 0;
}