n=int(input())
a=list(map(int,input().split()))
cnt=n
for i in range(n):
    if a[i]!=1:
        cnt=i+1
        break
cnt2=n
for i in range(n-1,-1,-1):
    if a[i]!=1:
        cnt2=n-i-1
        break
num=n-cnt
if cnt2==n:
    if n%2==0:
        print("Bob")
    else:
        print("Alice")
elif cnt2%2==0:
    print("Alice")
else:
    print("Bob")