#include <iostream>
#include <string>
#include <vector>
#include <algorithm>
using namespace std;
#define rep(i,n) for(int i=0; i<(int)(n); i++)

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    int N; cin >> N;
    vector<int> A(N);
    rep(i,N) cin >> A[i];
    int grundy = 0;
    for(int i=1; i<N; i+=2) grundy ^= A[i];
    if(grundy == 0) cout << "Bob\n"; else cout << "Alice\n";
    return 0;
}