#include <cstdio>
int main()
{
	int n,sol[5005],bf[5005],v[5005],i,j,min,p;
	
	freopen("subsir2.in","r",stdin);
	freopen("subsir2.out","w",stdout);
	scanf("%d",&n);
	for (i=1;i<=n;++i) scanf("%d",&v[i]);
	for (i=n;i>0;--i)
	{
		min=111111111;int s=min;
		for (j=i+1;j<=n;++j)
			if ((v[j]>=v[i]) && (v[j]<min))
				{min=v[j];if (sol[j]<=s) s=sol[j],p=j;}
		if (min==111111111)
			sol[i]=1; else
				sol[i]=sol[p]+1,bf[i]=p;
	}
	min=sol[1],p=1,j=v[1];
	for (i=2;i<=n;++i)
		if (v[i]<j)
		{
			j=v[i];
			if (sol[i]<=min) min=sol[i],p=i;
		}
	printf("%d\n%d ",min,p);
	while (--min)
	{p=bf[p];printf("%d ",p);}

return 0;
}