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

found = False
p = 0
for i in range(n-1, -1, -1):
    if a[i] > 1:
        p = n - i
        found = True
        break

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