using System;
using System.Linq;
using System.Collections.Generic;
using System.Text;
using System.Numerics;

class Node<T>
{
    private int Height { get; set; }
    private Node<T> Parent { get; set; }
    private long size;
    public long Size { get { return Find().size; } set { size = value; } }
    public T Item { get; }

    public Node(T item)
    {
        Height = 0;
        Parent = this;
        Item = item;
        Size = 1;
    }

    public Node<T> Find()
    {
        if (Parent == this)
        {
            return this;
        }
        var p = Parent.Find();
        Parent = p;
        return p;
    }

    public static void Unite(Node<T> a, Node<T> b)
    {
        var p = a.Find();
        var q = b.Find();
        if (p.Height < q.Height)
        {
            p.Parent = q;
            q.Height = Math.Max(p.Height + 1, q.Height);
            q.Size += p.Size;
            p.Size = 0;
        }
        else
        {
            q.Parent = p;
            p.Height = Math.Max(q.Height + 1, p.Height);
            p.Size += q.Size;
            q.Size = 0;
        }
    }
}

class MyClass
{
    public static void Solve()
    {
        var N = int.Parse(Console.ReadLine());
        var adj = new HashSet<int>[N];
        var uf = new Node<int>[N];
        for (int i = 0; i < N; i++)
        {
            adj[i] = new HashSet<int>();
            uf[i] = new Node<int>(i);
        }
        for (int i = 0; i < N-1; i++)
        {
            var input = Console.ReadLine().Split().Select(int.Parse).ToArray();
            var u = input[0];
            var v = input[1];
            adj[u].Add(v);
            adj[v].Add(u);
            Node<int>.Unite(uf[u], uf[v]);
        }
        var set = new HashSet<int>();
        for (int i = 0; i < N; i++)
        {
            set.Add(uf[i].Find().Item);
        }
        var comp = set.Count;
        var sol = 0;
        var deg1 = 0;
        for (int i = 0; i < N; i++)
        {
            if (adj[i].Count == 0)
            {
                sol++;
            }
            else if (adj[i].Count == 1)
            {
                deg1++;
            }
        }
        if (sol >= 2 || comp >= 3)
        {
            Console.WriteLine("Alice");
        }
        else if (comp == 1)
        {
            Console.WriteLine("Bob");
        }
        else
        {

        }
    }

    public static void Main()
    {
        var sw = new System.IO.StreamWriter(Console.OpenStandardOutput()) { AutoFlush = false };
        Console.SetOut(sw);
        Solve();
        Console.Out.Flush();
    }
}