#include <stdio.h>
#include <string.h>

#define Dim 5001

int v[Dim];

struct vector
{
	int x,pos;
}d[Dim];

int main()
{
	int N,i,j,size,pos,min;

	freopen("subsir2.in","r",stdin);

	scanf("%d",&N);
	for(i=1;i<=N;i++) scanf("%d",&v[i]);

	memset(d,0,sizeof(d));

	size=1;
	d[N].x=1;
	d[N].pos=N+1;
	for(i=N-1;i>0;i--)
	{
		d[i].x=N+1;
		d[i].pos=N+1;

		for(j=i+1;j<=N;j++)
			if(v[i]<=v[j])
			{
				if(d[i].x>d[j].x+1)
				{
					d[i].x=d[j].x+1;
					d[i].pos=j;
				}
				else
				if(d[i].x==d[j].x+1)
					if(v[j]<v[d[i].pos])
						d[i].pos=j;
				break;
			}
		if(d[i].x==N+1) d[i].x=1;
		if(d[i].x>size) size=d[i].x;
	}

	freopen("subsir2.out","w",stdout);

	printf("%d\n",size);

	pos=1;
	while(size)
	{
		printf("%d ",pos);

		min=N+1;
		for(i=pos+1;i<=N;i++)
			if(v[i]==size)
				if(min>v[i])
				{
					min=v[i];
					pos=i;
				}
		size--;
	}

	printf("\n");

	return 0;
}