#include <iostream>

using namespace std;

int main()
{
	string week;
	string w;
	cin >> week;
	w = week;
	cin >> week;
	w = w + week;
	int max = 0;
	int ren = 0;
	for( int i = 0; i < 14; i++ ) {
		if( w[i] == 'o' ) {
			ren++;
			if( max < ren ) {
				max = ren;
			}
		}
		else {
				ren = 0;
		}
	}
	cout << max << endl;

	return 0;
}