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#include<fstream>
using namespace std;
ifstream F("subsir2.in");
ofstream G("subsir2.out");
int n,i,a[5001],l[5001],p[5001],m,j,r[5001],q,k;
int main()
{
for(F>>n,i=1;i<=n;F>>a[i++]);
for(l[n]=1,i=n-1;i;l[i]=l[i]==n?1:l[i],--i)
for(m=1e9,l[i]=n,j=i+1;j<=n;++j)
if(a[j]>=a[i]&&a[j]<m)
if(m=a[j],l[i]>=l[j]+1)
l[i]=l[j]+1,p[i]=j;
for(j=1,i=2;i<=n;++i)
if(l[i]<=l[j]&&a[i]<a[j]) {
for(k=i,q=0;k;r[++q]=k,k=p[k]);
if(q==l[i])
j=i;
}
for(G<<l[j]<<'\n';j;G<<j<<' ',j=p[j]);
return 0;
}