#include <iostream>
#include <fstream>
using namespace std;

int const maxn = 5000;
int const maxv = 1000 * 1000;

typedef int A1 [maxn];
A1 A,L,I;

int
main ( ) {
  ifstream is ( "subsir2.in" );
  ofstream os ( "subsir2.out" );
  int n,i,k,l,a,b,y;
  is >> n;
  for ( i=0; n>i; ++i ) { is >> A[i]; }
  
  for ( i=n-1; 0<=i; --i ) {
    
    l=0;a=A[i]; b= 1+maxv; y=-1;
    
    for ( k=1+i; n>k; ++k )
      if ( a<=A[k] && b>A[k] ) {
          l=L[k]; b=A[k]; y=k;
				}
    
    L[i]=1+l; I[i]=y;
  }

  l=L[1]; y=1;
  for ( i=0; n>i; ++i )
    if ( l<=L[i] ) { l=L[i]; y=i; }

  os << l << endl; os << 1+y;
  for ( i=1; i<l; ++i ) {
    y=I[y]; os << ' ' << 1+y;
  }
  os << endl;

  return 0;
}