n = int(input())
a = list(map(int, input().split()))
a = a[::-1]  # Reverse the array to process from end to start

grundy_prev = 0
xor_sum = 0

for ai in a:
    if ai > grundy_prev:
        current = ai - grundy_prev
    else:
        current = 0
    xor_sum ^= current
    grundy_prev = current

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