n = int(input())
A = list(map(int, input().split()))

for i in range(n):
    if A[n - i - 1] != 1:
        if i % 2 == 0:
            print("Alice")
        else:
            print("Bob")
        exit()

if n % 2 == 1:
    print("Alice")
else:
    print("Bob")