N = gets.to_i
G = Array.new(2){Array.new(2,0)}
N.times do
  x,y = gets.split.map(&:to_i)
  G[x % 2][y % 2] += 1
end
puts G.flatten.map{|v| (v + 1) / 2 }.sum.odd? ? "Alice" : "Bob"