#include <bits/stdc++.h>
#define Nmax 100003
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int v[Nmax],best[Nmax],p[Nmax],L[Nmax];
int n,maxim,k,nr=1,poz;

void afis(int i)
{
    if(p[i]>0)afis(p[i]);
    g<<v[i]<<" ";
}

int caut(int x)
{
    int st=1,dr=nr,md;
    while(st<=dr)
    {
        md=(st+dr)/2;
        if(v[L[md]]<x and v[L[md+1]]>=x)return md;
        else if(v[L[md+1]]<x)st=md+1;
        else dr=md-1;
    }
    return nr;
}

int main()
{
    int i;
    f>>n;
    for(i=1;i<=n;i++)f>>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;
    g<<maxim<<"\n";
    afis(poz);
    return 0;
}