#include <iostream>
#include <numeric>
#include <algorithm>
#include <string>
#include <vector>

#define rep(i, a) FOR(i, 0, a)
#define FOR(i, a, b) for(int i = a; i < b; ++i)

std::string a, b, s;
int day[14];

int main(){
	std::cin >> a >> b;
	s = a + b;
	rep(i, 14)if (s[i] == 'o')day[i] = 1;
	FOR(i, 1, 14){
		if (day[i] == 0)day[i] = 0;
		else day[i] += day[i - 1];
	}
	std::cout << *std::max_element(day, day + 14) << std::endl;
	return 0;
}