open System
open System.Collections.Generic

[<AutoOpen>]
module Cin =
    let read f = stdin.ReadLine() |> f
    let reada f = stdin.ReadLine().Split() |> Array.map f
    let readChars() = read string |> Seq.toArray
    let readInts() = readChars() |> Array.map (fun x -> Convert.ToInt32(x.ToString()))

[<AutoOpen>]
module Cout =
    let writer = new IO.StreamWriter(new IO.BufferedStream(Console.OpenStandardOutput()))
    let print (s: string) = writer.Write s
    let println (s: string) = writer.WriteLine s
    let inline puts (s: ^a) = string s |> println

type UnionFind =
    { par: int array
      rank: int array }

[<RequireQualifiedAccess>]
[<CompilationRepresentation(CompilationRepresentationFlags.ModuleSuffix)>]
module UnionFind =

    let inline init (n: ^a) =
        let n = int n
        let par = Array.init n id
        let rank = Array.zeroCreate n
        { UnionFind.par = par
          rank = rank }

    let rec root x uf =
        let par = uf.par
        match x = par.[x] with
        | true -> x
        | false ->
            let px = par.[x]
            par.[x] <- root px uf
            par.[x]

    let find x y uf = (root x uf) = (root y uf)

    let unite x y uf =
        let par, rank = uf.par, uf.rank
        let rx, ry = root x uf, root y uf
        match rx = ry with
        | true -> false
        | false ->
            let large, small =
                if rank.[rx] < rank.[ry] then ry, rx else rx, ry
            par.[small] <- large
            rank.[large] <- rank.[large] + rank.[small]
            rank.[small] <- 0
            true

let main() =
    let n = read int
    let uni = UnionFind.init n
    for i in 0 .. n - 2 do
        let [| u; v |] = reada int
        uni
        |> UnionFind.unite u v
        |> ignore

    let o = uni |> UnionFind.root 0
    let ok = Array.forall (fun i -> UnionFind.root i uni = o) uni.par
    if ok then "Bob" else "Alice"
    |> puts
    ()

main()
writer.Close()