#include <bits/stdc++.h>

using namespace std;

typedef long long ll;
typedef unsigned long long ull;
typedef long double ld;
typedef pair<ll, ll> P;

#define EACH(i,a) for (auto& i : a)
#define FOR(i,a,b) for (ll i=(a);i<(b);i++)
#define RFOR(i,a,b) for (ll i=(b)-1;i>=(a);i--)
#define REP(i,n) for (ll i=0;i<(n);i++)
#define RREP(i,n) for (ll i=(n)-1;i>=0;i--)
#define debug(x) cout<<#x<<": "<<x<<endl
#define pb push_back
#define ALL(a) (a).begin(),(a).end()

const ll linf = 1e18;
const int inf = 1e9;
const double eps = 1e-12;
const double pi = acos(-1);

template<typename T>
istream& operator>>(istream& is, vector<T>& vec) {
	EACH(x,vec) is >> x;
	return is;
}
template<typename T>
ostream& operator<<(ostream& os, vector<T>& vec) {
	REP(i,vec.size()) {
		if (i) os << " ";
		os << vec[i];
	}
	return os;
}
template<typename T>
ostream& operator<<(ostream& os, vector< vector<T> >& vec) {
	REP(i,vec.size()) {
		if (i) os << endl;
		os << vec[i];
	}
	return os;
}

struct Data {
	char data;
	int pos;
};
bool operator==(const Data& d1, const Data& d2) {
	return d1.data == d2.data;
}

int main() {
	std::ios::sync_with_stdio(false);
	std::cin.tie(0);
	string s, s2; cin >> s >> s2; s += s2;
	vector<Data> v;
	REP(i, s.size()) {
		v.pb({s[i], i});
	}
	v.pb({'x', (int)s.size()});
	v.erase(unique(ALL(v)), v.end());
	int ans = 0;
	REP(i, v.size()) {
		if (v[i].data == 'o') {
			ans = max(ans, v[i+1].pos-v[i].pos);
		}
	}
	cout << ans << endl;
}