#include <bits/stdc++.h>
using namespace std;

int main() {
	int n;
	cin >> n;
	vector<int> a(n);
	for(auto &v : a) cin >> v;
	int f = 0;
	for(int i = 1; i < n; i += 2) {
		f ^= a[i];
	}
	puts(f ? "Alice" : "Bob");
}