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

trailing_ones = 0
found = False

for num in reversed(a):
    if num > 1:
        found = True
        break
    trailing_ones += 1

if not found:
    print("Alice" if n % 2 == 1 else "Bob")
else:
    print("Alice" if trailing_ones % 2 == 0 else "Bob")