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