#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	string S1, S2;
	cin >> S1 >> S2;
	S1 += S2;
	int ans = 0;
	REP(i, S1.size()) {
		if (S1[i] == 'x') continue;
		int cnt = 1;
		while (i + cnt < S1.size() && S1[i + cnt] == 'o') ++cnt;
		chmax(ans, cnt);
		i += cnt - 1;
	}
	cout << ans << endl;
}