#include <bits/stdc++.h>
#include <fstream>
#include <vector>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int main() {
  int n, k = 0;
  fin >> n;
  vector<int> cd(n, 0);
  for (int i = 0; i < n; i++) {
    int x;
    fin >> x;
    if (cd[k] < x)
      cd[++k] = x;
    else {
      int left = 1, right = k;
      while (left <= right) {
        int mid = (left + right) / 2;
        if (cd[mid] < x)
          left = mid + 1;
        else
          right = mid - 1;
      }
      k = left;
      cd[k] = x;
    }
  }
  fout << k << "\n";
  for (int i = 1; i <= k; i++)
    fout << cd[i] << " ";
  return 0;
}