#include<fstream>
using namespace std;
int l[5002],v[5002],i,j,k,t,maxim,n,aux,c[5002];
int main()
{
	ifstream f("subsir2.in");
	ofstream g("subsir2.out");
	f>>n;
	for(i=1;i<=n;i++)
	{
		f>>v[i];
		c[i]=i;
	}
	l[n]=1;
	for(i=n-1;i>0;i--)
	{
		maxim=0;
		for(k=i+1;k<=n;k++)
			if(v[k]>v[i]&&l[k]>maxim)
				maxim=l[k];
			l[i]=maxim+1;
	}
	for(i=1;i<=n;i++)
		if(maxim<l[i])
		{
			maxim=l[i];
			t=i;
		}
		for(i=1;i<=n-1;i++)
			for(j=i+1;j<=n;j++)
				if(v[i]>v[j]&&l[i]==l[j])
			      {
				aux=v[i];
				v[i]=v[j];
				v[j]=aux;
				aux=c[i];
				c[i]=c[j];
				aux=c[j];
				   }
				
		g<<maxim<<"\n";
		g<<t<<" ";
			for(i=t+1;i<=n;i++)
				if(v[i]>v[t]&&l[i]==maxim-1)
				{
					g<<c[i]<<" ";
					maxim--;
				}

	return 0;
}