#include<stdio.h>
long v[5001],b[5001],max,i,n,j,r,u,c[5001];
int main()
{
	freopen("subsir2.in","r",stdin);
	freopen("subsir2.out","w",stdout);
	scanf("%d",&n);
	for (i=1;i<=n;i++)
		scanf("%ld",&v[i]);
	b[1]=1;
	for (i=2;i<=n;i++)
	{
		max=0;
		for (j=1;j<=i;j++)
			if (v[i]>v[j])
			{
				if (max<b[j]+1)
					max=b[j]+1;
			}
		b[i]=max;
	}
	max=0;
	for (i=1;i<=n;i++)
	if (max<b[i])
		max=b[i];
	printf("%ld\n",max);
	for (i=n;i>=1;i--)
		if (b[i]==max)
		{
			c[++u]=i;
			max--;
		}
	for (i=u;i>=1;i--)
		printf("%ld ",c[i]);
}