#include <bits/stdc++.h>
using namespace std;
#define FOR(i,a,b) for(int i=(a);i<(b);++i)
#define REP(i,n) FOR(i,0,n)
#define ALL(v) begin(v),end(v)
template<typename A, typename B> inline bool chmax(A & a, const B & b) { if (a < b) { a = b; return true; } return false; }
template<typename A, typename B> inline bool chmin(A & a, const B & b) { if (a > b) { a = b; return true; } return false; }
using ll = long long;
using pii = pair<int, int>;
constexpr ll INF = 1ll<<30;
constexpr ll longINF = 1ll<<60;
constexpr ll MOD = 1000000007;
constexpr bool debug = false;
//---------------------------------//

int main() {
	int N;
	cin >> N;
	vector<int> A(N);
	REP(i, N) scanf("%d", &A[i]);
	
	bool dp[2] {};
	dp[0] = true; // 1 win
	dp[1] = true; // 2~infty win
	
	FOR(i, 1, N) {
		bool pr = dp[A[i - 1] != 1];
		if (pr) dp[0] = false, dp[1] = true;
		else dp[0] = dp[1] = true;
	}
	
	puts(dp[A[N - 1] != 1] ? "Alice" : "Bob");
}