import sys
import math
from math import sin, cos, tan
from functools import reduce
from collections import deque
import heapq
sys.setrecursionlimit(1000000)
intm1 = lambda x:int(x)-1

N = int(input())

alice = True
for a in reversed(input().split()):
	alice = alice == (a == '1')
print('Alice' if alice else 'Bob')