#include <fstream>
#define scmax 100003
using namespace std;

ifstream fin("scmax.in");
ofstream fout("scmax.out");

unsigned n, v[scmax], best[scmax], p[scmax], maxim, k, L[scmax], nr = 1;

void afisare(unsigned i)
{
    if (p[i] > 0)
        afisare(p[i]);
    fout << v[i] << ' ';;
}

unsigned cautare(unsigned x)
{
    unsigned p = 0, u, m;
    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()
{
    unsigned i, poz;
    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 = cautare(v[i]);
        p[i] = L[poz];
        best[i] = poz + 1;
        L[poz + 1] = i;
        if (nr < poz + 1)
            nr = poz + 1;
   }
    for (i = 1; i <= n; i++)
        if (maxim < best[i]){
          maxim = best[i];
          poz = i;
       }
   fout << maxim << '\n';
   afisare(poz);
   fout << '\n';
   fin.close();
   fout.close();
   return 0;
}