#include <bits/stdc++.h>
#define DMAX 100100
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
void citire();
int cautbinar(int x);
void afisare();
int best[DMAX],poz[DMAX],a[DMAX];
int n,val;
int sol[DMAX];
int nr;
int cate;
int main()
{
    citire();
    afisare();


}
void afisare()
{int i;
    fout<<cate<<'\n';
    for(i=n;i>0;i--)
        if(poz[i]==cate)
        {
            nr++;sol[nr]=a[i];cate--;
            if(cate==0)
                break;
        }
    for(i=nr;i>0;i--)
        fout<<sol[i]<<' ';
}
void citire()
{int i;
    fin>>n;
    for(i=1;i<=n;i++)
        {fin>>a[i];
        if(a[i]>best[cate])
        {cate++;best[cate]=a[i];poz[i]=cate;}
        else
            {

                val=cautbinar(a[i]);poz[i]=val;
                best[val]=a[i];
            }
        }

}

int cautbinar(int x)
{
    int st=0,mij;int dr=cate+1;
    while(dr-st>1)
    {
        mij=(st+dr)/2;
        if(best[mij]<x)
            st=mij;
        else
            dr=mij;
    }
    return dr;
}