#include <bits/stdc++.h>

using namespace std;

ifstream fin( "scmax.in" );
ofstream fout( "scmax.out" );

const int DIM = 1e5 + 1;
const int INF = 1e9;

int v[DIM];
int val[DIM], idx[DIM];
int prv[DIM];

void print_sol( int i ) {
  if ( prv[i] ) print_sol(prv[i]);
  fout << v[i] << " ";
}

int main() {
  ios_base::sync_with_stdio(0);
  fin.tie(0);
  int n;

  fin >> n;
  val[0] = -INF;
  for ( int i = 1; i <= n; ++i ) {
	fin >> v[i];
    val[i] = INF;
  }
  for ( int i = 1; i <= n; ++i ) {
	int pos = upper_bound(val + 1, val + n + 1, v[i]) - val;
	if ( val[pos - 1] < v[i] && val[pos] > v[i] ) {
	  val[pos] = v[i];
	  idx[pos] = i;
	  prv[i] = idx[pos - 1];
	}
  }
  int res = 0;
  for ( int i = 1; i <= n; ++i ) {
	if ( val[i] != INF ) res = i;
  }
  fout << res << "\n";
  print_sol(idx[res]);
  fin.close();
  fout.close();
  return 0;
}