N = gets.to_i
dsu = Array.new(N) { [_1] }
(N - 1).times do
    u, v = gets.split.map(&:to_i)
    x, y = dsu[u], dsu[v]
    x, y = y, x if x.size < y.size
    y.each do |i|
    	dsu[i] = x << i
    end
end

if dsu.any? { _1.size == 1 }
	puts :Alice
else
	puts :Bob
end