#include <fstream>

#define MAXN 5000
#define INF 1000000001

using namespace std;

ifstream f("subsir2.in");
ofstream g("subsir2.out");

int v[MAXN+2], l[MAXN+2], prep[MAXN+2];
int n, i, j, lmin, pos, minim;
int main()
{
    f>>n;
    for(i=1; i<=n; i++)
        f>>v[i];
    v[0]=-INF;
    for(i=n; i>=0; i--){
      minim=lmin=INF;
      pos=n+1;
      for(j=i+1; j<=n; j++)
        if(v[j]>=v[i] && v[j]<minim){
          minim=v[j];
          if(lmin>=l[j]){
            lmin=l[j];
            pos=j;
          }
        }
      if(lmin==INF)
        lmin=0;
      l[i]=lmin+1;
      prep[i]=pos;
    }

    g<<l[0]-1<<"\n";
    for(i=1, pos=prep[0]; i<l[0]; i++, pos=prep[pos])
      g<<pos<<" ";

    return 0 ;
}