#include<bits/stdc++.h>

using namespace std;
using ll = long long;
using pint = pair<int,int>;


int main()
{
	int N; cin >> N;
	vector<int> A(N);
	for(auto &i : A) cin >> i;
	if(count(A.begin(), A.end(), 1) == N) {
		cout << (N % 2 ? "Alice" : "Bob") << endl;
		return 0;
	}

	reverse(A.begin(), A.end());
	for(int i = 0; i < N; i++) {
		if(A[i] != 1) {
			if(i % 2 == 0) cout << "Alice" << endl;
			else cout << "Bob" << endl;
			return 0;
		}
	}


}