#include <fstream>

#define MAXN 100005

using namespace std;

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

int N, dp[MAXN], v[MAXN], nn, dad[MAXN];

inline int BinarySearch(int val) {
    int ii, step;

    for (step = 1; step <= nn; step <<= 1);

    for (ii = 0; step; step >>= 1) {
        if (ii + step <= nn && v[dp[ii + step]] < val)
            ii += step;
    }
    return ii;
}

inline void Afis(int a) {
    if (a) {
        Afis(dad[a]);

        fout << v[a] << " ";
    }
}

inline void Read() {
  fin >> N;

  int poz;

  for (int i = 1; i <= N; i++) {
      fin >> v[i];

      poz = BinarySearch(v[i]);
      nn = max(nn, poz + 1);
      dad[i] = dp[poz];
      dp[poz + 1] = i;
  }

  fout << nn << "\n";

  Afis(dp[nn]);
}

int main () {
  Read();

  fin.close(); fout.close(); return 0;
}