n = int(input())
a = list(map(int, input().split()))[::-1]
for i in range(n):
    if a[i] >= 2:
        if i % 2 == 0:
            print('Alice')
        else:
            print('Bob')
        exit()
if n % 2 == 1:
    print('Alice')
else:
    print('Bob')