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#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,i,a[100010],l[100010],p[100010],poz,maxim,pozz;
void afisare(int x)
{
if (x==0)
return;
afisare(p[x]);
fout << x << ' ';
}
int main()
{
fin >> n;
for(int i=1;i<=n;i++)
l[i] = 2000000009;
for (i=1; i<=n; i++)
{
fin >> a[i];
poz=lower_bound(l+1, l+maxim+1, a[i])-l-1;
l[poz]=a[i];
p[i]=l[poz-1];
if (poz>maxim)
maxim=poz,pozz=poz;
}
fout << maxim << '\n';
afisare(pozz);
fout << '\n';
}