#include<fstream>
using namespace std;
ofstream fout("subsir2.out");
long long  v[5010],l[5010],next[5010],n;
void citire();
void afis();
void dinamic();
int main()
{
	citire();
	dinamic();
	afis();
	return 0;
}
void citire()
{
	ifstream fin("subsir2.in");
	fin>>n;
	for(int i=1;i<=n;i++)
		fin>>v[i];
}
void dinamic()
{
	l[n]=1,next[n]=-1;
	for(int i=n-1;i>=1;i--)
	{
		l[i]=1,next[i]=-1;
		for(int j=i+1;j<=n;j++)
			if(v[i]<=v[j])
				if(l[i]<l[j]+1)
				{
					l[i]=l[j]+1;
					next[i]=j;
				}
	}
}
void afis()
{
	int start=1;
	for(int i=1;i<=n;i++)
		if(l[start]<l[i])
			start=i;
		fout<<l[start];
		fout<<endl;
		for(int i=start;i!=-1;i=next[i])
			fout<<i<<" ";
}