#include <stdio.h>   
long int n, v[1000], best[1000], p[1000], maxim, k, L[1000], nr;

void afis(int i)
{
   if (p[i] > 0)  afis(p[i]);
   printf("%d ",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()
{
   freopen("scmax.in","r",stdin);
   freopen("scmax.out","w",stdout);
   int i, j, poz;
   nr = 1;

   scanf("%ld",&n);
   for (i = 1; i <= n; i++) scanf("%ld", 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;   
}