let n = stdin.ReadLine () |> int
let a = stdin.ReadLine().Split " " |> Array.map int

a |> Array.mapi (fun index n -> if index % 2 = 0 then 1 elif n > 1 then 2 else 1) |> Array.sum |> fun x -> printfn "%s" (if x % 2 = 1 then "Alice" else "Bob")