//GIVE ME AC!!!!!!!!!!!!!!!!!
#pragma GCC target("avx")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
#include<bits/stdc++.h>
#define ll long long
#define floatset() fixed<<setprecision(15)
#define all(n) n.begin(),n.end()
#define rall(n) n.rbegin(),n.rend()
#define rep(i, s, n) for (ll i = s; i < (ll)(n); i++)
using namespace std;
const int dx[4] = {1, 0, -1, 0};
const int dy[4] = {0, 1, 0, -1};
const ll inf =1e18;
const ll MOD=1000000007;
const ll mod=998244353;
const double pi=acos(-1);
using P=pair<ll,ll>;
int main(){
    ll ans=1;
    ll n;
    cin>>n;
    ll a[n];
    rep(i,0,n){
        cin>>a[i];
    }
    for(ll i=n-1;i>=0;i--){
        if(a[i]==1){
            ans=1-ans;
        }
    }
    if(ans){
        cout<<"Alice"<<endl;
    }
    else{
        cout<<"Bob"<<endl;
    }
}