#include <stdio.h>
int n, v[100003], best[100003], p[100003], maxim, k, L[100003], nr;

void afisare(int i)
{
   if (p[i] > 0)
    afisare(p[i]);
   printf("%d ",v[i]);
}

int caut(int x)
{
   int p, u, mij;
    p = 0;
    u = nr;
    mij = (p+u)/2;
   while (p <= u)
   {
      if (v[L[mij]] < x &&  v[L[mij+1]] >= x)
        return mij;
      else if (v[L[mij+1]] < x)
      {
          p = mij + 1;
          mij = (p + u)/2;}
      else
      {
          u = mij - 1;
          mij = (p + u)/2;
      }
   }
   return nr;
}

int main()
{

   freopen("scmax.in","r",stdin);
   freopen("scmax.out","w",stdout);
   int i, j, poz;
   nr = 1;

   scanf("%d",&n);
   for (i = 1; i <= n; i++)
    scanf("%d", 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;
       }
   printf("%d\n",maxim);
   afisare(poz);
   return 0;
}