#include <iostream>
#include <fstream>

using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int v[100001],pozmic[100001],pred[100001], n, m;

void subsir (int p)
{
    if (pred[p]!=0)
        subsir(pred[p]);
    g<<v[p]<<" ";
}

int cautbin (int x)
{
    int r=0,pas=1<<16;
    while (pas!=0)
    {
        if (r+pas<=m && v[pozmic[r+pas]]<x)
            r+=pas;
        pas/=2;
    }
    return r;
}

int main()
{
    int j,i;
    f>>n;
    m=0;
    for (i=1;i<=n;i++)
        f>>v[i];
    for (i=1;i<=n;i++)
    {
        j=cautbin(v[i]);
        pozmic[j+1]=i;
        pred[i]=pozmic[j];
        if (j==m)
        {
            m++;
        }
    }
    g<<m<<"\n";
    subsir(pozmic[m]);
    return 0;
}