#include<iostream>
#include<string>
#include<string.h>
#include<algorithm>
#include<stdio.h>
#include<cmath>
#include<vector>
#include<utility>
#include<stack>
#include<queue>
#include<list>
#include<bitset>

#define FOR(i, a, b) for(int i=(a);i<=(b);i++)
#define RFOR(i, a, b) for(int i=(a);i>=(b);i--)
#define MOD 1000000007
#define INF 1000000000

using namespace std;


int main(void) {
	char c[15];
	int point = 0;
	int sum = 0;

	FOR(i, 1, 14) {
		cin >> c[i];
	}
	FOR(i, 1, 14) {
		if (c[i] == 'o') {
			point++;
		}
		else {
			if (point > sum) {
				sum = point;
			}
			point = 0;
		}

	}if (point > sum) {
		sum = point;
	}
	cout << sum << endl;
	return 0;
}