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

xor_even = 0
xor_odd = 0

for i in range(1, n):
    # 山 i+1 (0-indexedではi)
    pos = i + 1
    if pos % 2 == 0:
        xor_even ^= a[i]
    else:
        xor_odd ^= a[i]

print("Alice" if xor_even != xor_odd else "Bob")