n = int(input())
a = list(map(int,input().split()))
c = 0
for i in range(2,n+1):
  ai = a[i-1]
  if i % 2 == 1:
    c += ai*2 
  else:
    c += ai 
if c % 2 == 1:
  print("Alice")
else:
  print("Bob")