N = gets.to_i
A = gets.split.map(&:to_i)

if A.last != 1
  puts 'Alice'
  exit
end

turn = 0

while A.last == 1
  A.pop
  turn += 1
end

if A.empty?
  if turn % 2 == 0
    puts 'Bob'
  else
    puts 'Alice'
  end
else
  if turn % 2 == 0
    puts 'Alice'
  else
    puts 'Bob'
  end
end