#include <iostream>
#include <fstream>
# define Nmax 100001
using namespace std;
int n,v[Nmax],a[Nmax],i,w[Nmax],x,lung,lungmax,j,poz,q[Nmax];
ifstream f("scmax.in");
ofstream g("scmax.out");
int caut(int x)
{
    int s=1,d=lung,poz=-1;
    bool gasit=true;
    while(s<=d)
    {

        int mid=(s+d)/2;
        if(x==a[mid]) gasit=false;
        if(x<a[mid])
        {
            d=mid-1;
            poz=mid;
        }
        if(x>=a[mid])s=mid+1;

    }
    if(gasit==false)poz=0;
    return poz;

}
int main()
{
    f>>n;
    for(i=1; i<=n; i++) f>>v[i];
    lung=1;
    a[1]=v[1];
    for(i=2; i<=n; i++)
    {

        poz=caut(v[i]);
        if(poz==-1)
        {
            lung++;
            a[lung]=v[i];
            q[i]=lung;
        }
        else if(poz!=0)
        {
            a[poz]=v[i];
q[i]=poz;
        }

    if(lung>lungmax)
        lungmax=lung;


    }
    g<<lungmax<<'\n';lung=lungmax;i=n;
while(q[i]!=lung)i--;w[lung]=v[i];
for(i=n;i>=1;i--){
if(w[lung]>v[i] and v[i]>w[lung-1] and q[i]==lung)w[lung]=v[i];
if(q[i]==lung-1 and v[i]<w[lung]){
    w[lung-1]=v[i];lung--;
}   if(lung==0) break;

}for(i=1;i<=lungmax;i++) g<<w[i]<<" ";



}