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#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,m;
int v[100002],aux[100002],pred[100002];
const int L=16;
int cautb(int x)
{
int r,pas;
r=0;
pas=1<<L;
while(pas!=0)
{
if(r+pas<=m && v[aux[r+pas]]<x)
r+=pas;
pas/=2;
}
return r;
}
void sir(int p)
{
if(pred[p]!=0)
sir(pred[p]);
fout<<v[p]<<" ";
}
int main()
{
int j;
fin>>n;
for(int i=1; i<=n; i++)
fin>>v[i];
m=1;
aux[1]=1;
for(int i=2; i<=n; i++)
{
j=cautb(v[i]);
if(j==m)
{
m++;
}
pred[i]=aux[j];
aux[j+1]=i;
}
fout<<m<<"\n";
sir(aux[m]);
return 0;
}