#include <iostream>
using namespace std;

int n;
int a[200000];

signed main() {
	int i;
	
	cin >> n;
	for (i = 0; i < n; i++) cin >> a[i];
	
	bool ans = false;
	for (i = 0; i < n; i++) {
		if (ans == false) {
			ans = true;
		}
		else {
			if (a[i] == 1) {
				ans = false;
			}
			else {
				ans = true;
			}
		}
	}
	
	if (ans) cout << "Alice" << endl;
	else cout << "Bob" << endl;
	return 0;
}