n = gets.chomp.to_i
b = {}
(n-1).times do
  u, v = gets.chomp.split.map(&:to_i)

  b[u] ||= []
  b[u] << v
  b[v] ||= []
  b[v] << u
end
visited = [0]
mins = [0xffffffff] * n
q = [[0, 0]]
until q.empty?
  p, c = q.shift

  b[p].each do |bi|
    next if c + 1 >= mins[bi]

    mins[bi] = c + 1
    visited << bi
    q.push([bi, c + 1])
  end
end
puts visited.uniq.size == n ? 'Bob' : 'Alice'