#include <iostream>
#include <fstream>
#define nmax 1000001

using namespace std;

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

int n,v[nmax],subs[nmax],lg_sir,i,j,st,dr,mij,nr,indice[nmax];

bool c[nmax];

void afisare(int i)
{
    int j;
    for(j=i-1;j>=1;j--)
        if(indice[j] == indice[i]-1 && indice[j] >= 1)
        {
            afisare(j);
            break;
        }
    fout<<v[i]<<' ';
}

int main()
{
    fin>>n;
    fin>>v[1];
    subs[1]=v[1];
    lg_sir=1;
    for(i=2; i<=n; i++)
    {
        fin>>v[i];
        st=1;
        dr=lg_sir;
        while(st <= dr)
        {
            mij=(st+dr)/2;
            if(v[i]>subs[mij])
                st=mij+1;
            else
                dr=mij-1;
        }
         if(subs[dr] == v[i])
            continue;
        subs[dr+1]=v[i];
        indice[i]=dr+1;
        if(dr+1 > lg_sir)
            lg_sir++;
    }
    fout<<lg_sir<<'\n';
    for(i=n;i>=1;i--)
        if(indice[i] == lg_sir)
         {
             afisare(i);
             break;
         }
    return 0;
}