#include <bits/stdc++.h>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, v[100003], best[100003], p[100003], maxim, k, L[100003], nr;
void afis(int i)
{
   if (p[i] > 0)  afis(p[i]);
   fout<<v[i]<<' ';
}
int caut(int x)
{
   int p, u, m;
   p = 0; u = nr; m = (p+u)/2;
   while (p <= u)
   {
      if (v[L[m]] < x &&  v[L[m+1]] >= x) return m;
      else if (v[L[m+1]] < x) {p = m + 1; m = (p + u)/2;}
      else {u = m - 1; m = (p + u)/2;}
   }
   return nr;
}

int main()
{
   int i, j, poz;
   nr = 1;
   fin>>n;
   for (i = 1; i <= n; i++) 
   {
       fin>>v[i];
   }
   best[1] = L[1] = 1; L[0] =  0;
   for (i = 2; i <= n; i++)
   {
      poz = caut(v[i]);
      p[i] = L[poz];
      best[i] = poz + 1;
      L[poz + 1] = i;
      if (nr < poz + 1)   nr = poz + 1;
   }
   maxim = 0; poz = 0;
   for (i = 1; i <= n; i++)
       if (maxim < best[i])
       {
          maxim = best[i]; poz = i;
       }
   fout<<maxim<<'\n';
   afis(poz);
   return 0;   
}