import java.util.*;

public class Main {
    
    public static void main(String[] args) {
        
        Scanner sc = new Scanner(System.in);
        int N = sc.nextInt();
        int[] A = new int[N];
        String[] ans = {"Bob","Alice"};
        for( int i = 0; i < N; i++ ) {
            A[i] = sc.nextInt();
        }
        
        for( int i = N-1; i >= 0; i-- ) {
            if( A[i] != 1 ) {
                System.out.println(ans[(N-i)%2]);
                return;
            }
        }
        
        System.out.println(ans[N%2]);
        
    }
    
}