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#include <iostream>
#include <fstream>
#include <vector>
#include <algorithm>
using namespace std;
const int oo=2000000000;
ifstream in ("scmax.in");
ofstream out("scmax.out");
int pos, elem[100001], a[100001], prv[100001], prvarr[100001], maxi, pozmaxi, n;
void afis(int poz)
{
if(poz==0)
return;
afis(prv[poz]);
out<<a[poz]<<" ";
}
int main()
{
in>>n;
elem[0]=-oo;
for(int i=1; i<=n; i++)
in>>a[i], elem[i]=oo;
for(int i=1; i<=n; i++)
{
pos=upper_bound(elem, elem+2+n, a[i])-elem;
if(elem[pos]>a[i]&&a[i]>elem[pos-1])
{
if(pos>maxi)
maxi=pos, pozmaxi=i;
elem[pos]=a[i];
prv[i]=prvarr[pos-1];
prvarr[pos]=i;
}
}
out<<maxi<<"\n";
afis(pozmaxi);
return 0;
}