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#include<fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
const int L=100000;
int v[L],lung[L],val[L],poz[L],pred[L],m;
int cautb(int);
void subsir(int);
int main()
{
int n,j;
fin>>n;
for(int i=0;i<n;i++) fin>>v[i];
m=0;
for(int i=0;i<n;i++)
{
j=cautb(v[i]);
if(j==m) m++;
val[j+1]=v[i];
poz[j+1]=i;
lung[i]=j+1;
if(j==0) pred[i]=-1;
pred[i]=poz[j];
}
fout<<m<<'\n';
subsir(poz[m]);
return 0;
}
int cautb(int x)
{
int r=0,pas=1<<16;
while(pas)
{
if(r+pas<=m&&val[r+pas]<x) r+=pas;
pas/=2;
}
return r;
}
void subsir(int p)
{
if(pred[p]!=0) subsir(pred[p]);
fout<<v[p]<<' ';
}