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