#include <fstream>

#define NMax 100100
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");

int nr,n,i,bestAct;
int best[NMax];
int a[NMax];
int v[NMax];
int selectedFor[NMax];

void BinarySearch(int target)
{
    int in=1,sf=nr;
    int mij=(in+sf)/2;

    while(in<=sf)
    {
        if(best[mij]==target)
            return;
        if(best[mij]<target)
            in=mij+1;
        else
            sf=mij-1;

        mij=(in+sf)/2;
    }

    best[in]=target;
    selectedFor[i]=in;

}

int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>a[i];

        if(a[i]>best[nr])
        {
            best[++nr]=a[i];
            selectedFor[i]=nr;
            bestAct=i;
        }
        else
        {
            BinarySearch(a[i]);
        }
    }

    fout<<nr<<'\n';

    int searchFor=nr;

    for(i=bestAct;i>=1;i--)
        if(selectedFor[i]==searchFor)
            v[searchFor]=a[i],searchFor--;

    for(i=1;i<=nr;i++)
        fout<<v[i]<<' ';
    return 0;
}