n = int(input())
a = list(map(int, input().split()))

even_xor = 0
odd_xor = 0

for i in range(1, n):
    if (i + 1) % 2 == 0:  # since a[0] is pile 1, i=0 corresponds to pile 1
        even_xor ^= a[i]
    else:
        odd_xor ^= a[i]

total = even_xor ^ odd_xor
print("Alice" if total != 0 else "Bob")