n, *rest = map(int, open(0).read().split())
A = rest[:n]

even_xor = 0
odd_xor = 0

for i in range(1, n):
    # pile i+1 is index i in the list (since A_1 is first)
    pile = i + 1
    if pile % 2 == 0:
        even_xor ^= A[i]
    else:
        odd_xor ^= A[i]

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