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#include <fstream>
#define lmax 5001
#define inf 10000000
using namespace std;
ifstream f("subsir2.in");
ofstream g("subsir2.out");
long long i,j,n,ma=inf,maa,poz,pozprec,nr;
long long a[lmax],b[lmax];
int main()
{
f>>n;
for (i=1;i<=n;i++)
f>>a[i];
b[n]=1;
for (i=n-1;i>=1;i--)
for (j=1+i;j<=n;j++)
if (a[i]<=a[j] && b[i]<b[j]+1)
b[i]=b[j]+1;
for (i=1;i<=n;i++)
if (a[i]<ma)
{
ma=a[i];
maa=b[i];
poz=i;
}
g<<maa<<'\n';
pozprec=i;
for (i=maa;i>=1;i--)
{
nr=inf;
for (j=pozprec+1;j<=n;j++)
if (b[j]==i && a[j]<nr)
{
poz=j;
nr=a[j];
}
g<<poz<<" ";
pozprec=poz;
}
f.close();
g.close();
}