#include <iostream>
#include <string>
#include <algorithm>
#include <vector>
#include <iomanip>
#include <cmath>
#include <stdio.h>
#include <queue>
#include <deque>
#include <cstdio>
#include <set>
#include <map>
#include <bitset>
#include <stack>
#include <cctype>
int a[200020];
using namespace std;
int main() {
	int n;
	cin >> n;
	int co = 0;
	for (int i = 0; i < n; i++) {
		cin >> a[i];
	}
	for (int i = 0; i < n; i++) {
		if (a[i] == 1) {
			co++;
		}
		else {
			break;
		}
	}
	if (co == n) {
		if (co % 2 == 0) {
			cout << "Bob" << endl;
		}
		else {
			cout << "Alice" << endl;
		}
	}
	else {
		if (co % 2 == 0) {
			cout << "Alice" << endl;
		}
		else {
			cout << "Bob" << endl;
		}
	}
}