#include<fstream>
using namespace std;

int i,j,n,l[5001],a[5001],k,max1,t,min1;
int main()
{
	ifstream f("subsir2.in");
	ofstream g("subsir2.out");
	f>>n;
	for(i=1;i<=n;i++)
		f>>a[i];
	l[n]=1;
	for(k=n-1;k>=0;k--)
	{
		for(j=k+1;j<=n;j++)
			if(a[k]<=a[j]&&l[k]<=l[j]+1)
				l[k]=l[j]+1;
	}
	max1=l[1];
	t=1;
	for(j=2;j<=n;j++)
		if(l[j]>max1)
		{
			max1=l[j];
			t=j;
		}
		g<<max1<<"\n"<<t<<" ";
		for(i=t+1;i<=n;i++)
			if(a[i]>a[t]&&l[i]==l[t]-1)
			{
				min1=i;
				for(k=i+1;k<=n;k++)
					if(l[k]==l[t]-1&&a[k]<a[i])
						min1=k;
				g<<min1<<" ";
				l[t]--;
				
			}
			return 0;
}