N=int(input())
A=list(map(int, input().split()))
cnt=0
for i in range(N)[::-1]:
    if A[i]==1:
        cnt+=1
    else:
        break
if cnt==N:
    if cnt%2==0:
        print("Bob")
    else:
        print("Alice")
else:
    if cnt%2==0:
        print("Alice")
    else:
        print("Bob")