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

using namespace std;
int main(){
	string s1, s2;
	int cnt=0,maxv=0;
	bool flag = false;
	cin >> s1 >> s2;

	for (int i = 0; i < s1.size(); i++) {
		if (s1[i] == 'o') {
			cnt++;
		} else {
			maxv=max(maxv, cnt);
			cnt = 0;
		}
	}

	for (int i = 0; i < s2.size(); i++) {
		if (s2[i] == 'o') {
			cnt++;
		} else {
			maxv = max(maxv, cnt);
			cnt = 0;
		}
	}
	maxv = max(maxv, cnt);
	cout << maxv << endl;
}