#include <iostream>
#include <bits/stdc++.h>
using namespace std;
ifstream fin("subsir2.in");
ofstream fout("subsir2.out");
long long i,j,n,a[5005],l[5005],nr,lmax,imax,nri,nrmin;
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>a[i];
    for(i=n;i>=1;i--)
    {
        for(j=i+1;j<=n;j++)
            if(a[i]<=a[j]&&l[i]<1+l[j])
                l[i]=1+l[j];

        if(l[i]==0)
            l[i]=1;
        if(l[i]>lmax)
            lmax=l[i];

    }
    fout<<lmax<<'\n';
    while(lmax>=1)
    {
        nr=1e9;
        imax=nri;
        for(i=imax+1;i<=n;i++)
            if(l[i]==lmax)
                if(nr>a[i])
                {
                    nr=a[i];
                    nri=i;
                }
        fout<<nri<<" ";
        lmax--;
    }
    return 0;
}