#include <iostream>
#include <vector>
#include <cstdio>
#include <sstream>
#include <map>
#include <string>
#include <algorithm>
#include <queue>
#include <cmath>
#include <set>
using namespace std;

int main(){
	string a,b;
	cin >> a >> b;
	a += b;

	int ans = 0;
	int last = -100;
	int tmp = 0;
	for(int i=0; i<a.size(); i++){
		if(a[i] == 'o'){
			if(last == i-1){
				tmp++;
			}else{
				tmp = 1;
			}
			ans = max(ans, tmp);
			last = i;
		}
	}

	cout << ans << endl;

	return 0;
}