#include<stdio.h>
int a[200005];
int main()
{
	int n;
	scanf("%d", &n);
	int i;
	for (i = 0; i < n; i++)
		scanf("%d", &a[i]);
	int f = 0;
	for (i = 0; i < n; i++)
	{
		if (f == 0)
			f = 1;
		else if (a[i] == 1)
			f = 0;
		else
			f = 1;
	}
	if (f > 0)
		printf("Alice\n");
	else
		printf("Bob\n");
	return 0;
}