#include <bits/stdc++.h>
using namespace std;
int main () {
    int N;
    cin >> N;
    int ans1 = 0, ans2 = 0;
    for (int i = 0; i < N; i ++) {
        int a;
        cin >> a;
        (i % 2 ? ans1 : ans2) ^= a;
    }
    cout << (ans1 + ans2 ? "Alice" : "Bob") << endl;
}