#include<cstdio>
#include<fstream>

using namespace std;

#define mm 100001

int v[mm],best[mm],p[mm],L[mm];
int n,maxim, k,nr;

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

int caut(int x)
{
   int st=0, dr=nr;
   while (st <= dr)
   {
   	int m = (st+dr)>>1;
      if (v[L[m]] < x &&  v[L[m+1]] >= x) return m;
      else if (v[L[m+1]] < x) st = m + 1;
      else dr = m - 1;
   }
   return nr;
}

int main()
{

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

   in>>n;
   for (i = 1; i <= n; i++) in>>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);
   afis(poz);
   return 0;
}