#include <stdio.h>

int main()
{
	int i, N, A[200001];
	scanf("%d", &N);
	for (i = 1; i <= N; i++) scanf("%d", &(A[i]));
	
	int x = 0;
	for (i = 2; i <= N; i += 2) x ^= A[i];
	if (x == 0) printf("Bob\n");
	else printf("Alice\n");
	fflush(stdout);
	return 0;
}