N = gets.to_i
G = Array.new(N){ [] }
(N - 1).times do
  u,v = gets.split.map(&:to_i)
  G[u] << v
  G[v] << u
end
USED = Array.new(N)

def bfs(s)
  q = [s]
  USED[s] = true
  
  until q.empty?
    u = q.shift
    G[u].each do |v|
      if !USED[v]
        q << v 
        USED[v] = true
      end
    end
  end
  s
end

c = N.times.count do |s|
  bfs(s) if !USED[s]
end
if c == 1
  puts "Bob"
elsif c >= 3
  puts "Alice"
else
  puts N.times.all?{|i| G[i].size == 2 || G[i].size == 0 } ? "Bob" : "Alice"
end