#include<iostream>
#include<cstdio>
#include<string>
using namespace std;

int main() {
	string str, temp;
	cin >> str;
	cin >> temp;
	str += temp;
	str += "x";

	int ans = 0, t = 0;
	for (int i = 0; i < 14; i++)
	{
		if (str[i]=='o')
		{
			t++;
			if (str[i+1] != 'o')
			{
				ans = ans > t ? ans : t;
				t = 0;
			}
		}
	}
	cout << ans << endl;

	return 0;
}