#include <fstream>
#define NMAX 100002

using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, lgbest;
int a[NMAX];
int best[NMAX];
int poz[NMAX];
int sol[NMAX];
int cautbin(int x);
int main()
{int i, j, pozai;
 ///citire
 fin>>n;
 for (i=1; i<=n; i++) fin>>a[i];
 best[1]=a[1]; poz[1]=1; lgbest=1;
 for (i=2; i<=n; i++)
      if (a[i]>best[lgbest]) {best[++lgbest]=a[i]; poz[i]=lgbest;}
          else
          {
           pozai=cautbin(a[i]);
           best[pozai]=a[i];
           poz[i]=pozai;
          }
 ///afisare
 fout<<lgbest<<'\n';
 for (j=n, i=lgbest; i>0; j--)
     if (poz[j]==i) {sol[i]=a[j]; i--;}
 for (i=1; i<=lgbest; i++)
     fout<<sol[i]<<' ';

 fout<<'\n';
 fout.close();
 return 0;
}

int cautbin(int x)
///caut cel mai mic element >=x in vectorul best de la 1 la lgbest
{int st=0, dr=lgbest+1, mij;
 while (dr-st>1)
       {
        mij=(st+dr)/2;
        if (best[mij]<x) st=mij;
           else dr=mij;
       }
 return dr;
}