#include <fstream>
#include <iostream>

using namespace std;
//ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, v[100003], best[100003], p[100003], maxim, k, L[100003], nr,i, j, poz;

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()
{
    freopen("scmax.in","r",stdin);
    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;
       }
   fout<<maxim<<'\n';
   afis(poz);
   return 0;
}