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

int n;
bool rev;
int main() {
	cin >> n;
	vector a(n, 0);
	for(auto &v : a) cin >> v;

	while(a.size() and a.back() == 1)
		a.pop_back(), rev ^= 1;
	if(a.empty()) rev ^= 1;
	
	cout << (rev ? "Bob\n" : "Alice\n");
	return 0;
}