import sys
sys.setrecursionlimit(10 ** 6)
def II(): return int(sys.stdin.readline())
def LI(): return list(map(int, sys.stdin.readline().split()))
def LC(): return list(input())
def IC(): return [int(c) for c in input()]
def MI(): return map(int, sys.stdin.readline().split())
INF = float('inf')
MOD = 10**9 + 7
def solve():
    N = II()
    A = LI()
    Alice = True
    for last in range(N-1,-1,-1):
        if(A[last] == 1):
            Alice = not Alice
        else:
            break
        #最後まで1だった場合、空列で先行になる人が負け
        if(last == 0):
            Alice = not Alice
    if(Alice):
        print("Alice")
    else:
        print("Bob")
    return
solve()