#include<fstream>
using namespace std;
ifstream fin("subsir2.in");
ofstream fout("subsir2.out");
int v[5001],l[5001],n;
int main() {
	int i,j,pmax,max;
fin>>n;
for(i=1;i<=n;i++) fin>>v[i];
l[n]=1;
for(i=n-1;i>=1;i--) {
	max=0;
	for(j=i;j<=n;j++) 
		if(v[i]<v[j]&&l[j]>max) max=l[j];
	l[i]=max+1;
}
for(i=1;i<=n;i++) 
	if(l[i]>max) {
		max=l[i];
		pmax=i;
	}
	else if(l[i]==max&&v[i]<v[pmax]) pmax=i;
	
fout<<max<<"\n";
fout<<pmax<<" ";
max--;
int last=v[pmax],y;
while(max) {
	y=1000001;
	for(i=pmax+1;i<=n;i++) 
		if(l[i]==max&&v[i]>last&&v[i]<y) {
			pmax=i;
			y=v[i];
		}
	fout<<pmax<<" ";
	last=v[pmax];
	max--;
}
return 0;
}