n,ans;
a[2][2],x,y;
main(){
	scanf("%d",&n);
	while(n--){
		scanf("%d%d",&x,&y);
		a[x%2][y%2]++;
	}
	puts((a[0][0]/2+a[0][1]/2+a[1][0]/2+a[1][1]/2)%2?"Alice":"Bob");
}