import sys
input = sys.stdin.readline

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

LOSE=0

for a in A[:N-1]:
    if a==1:
        LOSE=1-LOSE
    else:
        LOSE=1

# print(LOSE)

if LOSE==0:
    if N%2==0:        
        if A[-1]==1:
            print("Alice")
        else:
            print("Bob")
    else:
        if A[-1]!=1:
            print("Alice")
        else:
            print("Bob")
        
else:
    if N%2==0:
        print("Alice")
    else:
        print("Bob")