N = gets.to_i
P = N.times.map { gets.split.map(&:to_i) }

A = P.select { |x, _| x.odd? }
B = P.select { |x, _| x.even? }

C = A.select { |_, y| y.odd? }
D = A.select { |_, y| y.even? }

E = B.select { |_, y| y.odd? }
F = B.select { |_, y| y.even? }

cnt = C.size / 2 + D.size / 2 + E.size / 2 + F.size / 2

if cnt.even?
  puts 'Bob'
else
  puts 'Alice'
end