island_num = gets.to_i
bridge_num = island_num - 1
island_with_bridge = []
bridge_num.times do
  islands = gets.split
  island_with_bridge << islands[0] unless island_with_bridge.include?(islands[0])
  island_with_bridge << islands[1] unless island_with_bridge.include?(islands[1])
end

puts(island_with_bridge.length == island_num ? "Bob" : "Alice")