#include <iostream>
#include <algorithm>
using namespace std;
 
int main(){
	string S1, S2;
	cin >> S1 >> S2;
	int continuity = 0;
	int ans = 0;
	for(int i = 0; i < 7; i++){
		if(S1[i] == 'o'){
			continuity++;
			ans = max(ans, continuity);
		}else{
			continuity = 0;
		}
	}
	for(int i = 0; i < 7; i++){
		if(S2[i] == 'o'){
			continuity++;
			ans = max(ans, continuity);
		}else{
			continuity = 0;
		}
	}
	cout << ans << endl;
}