n = int(input())
A = list(map(int, input().split()))
i = 0
while A and A[-1] == 1:
    A.pop()
    i += 1
if A:
    if i%2 == 0:
        print('Alice')
    else:
        print('Bob')
else:
    if i%2 == 1:
        print('Alice')
    else:
        print('Bob')