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

xor = 0
for i in range(1, n):
    if (i+1) % 2 == 0:  # since a is 0-based, original index is i+1 (1-based)
        xor ^= a[i]

print("Alice" if xor != 0 else "Bob")