#include<fstream>
#define NMAX 100010

using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int n, m, a[NMAX], vz[NMAX], b[NMAX], nr[NMAX];

void Citeste()
{
    int i;
    f>>n;
    for (i=1; i<=n; ++i) f>>a[i];
}

int cauta(int x)
{
    int st=1, dr=m, mij, pz=m+1;

    while (st<dr)
    {
        mij=(st+dr)/2;
        if (b[mij]<x)
        {
            pz=mij;
            dr=mij-1;
        }
        else st=mij+1;
    }
    return pz;
}

void Solve()
{
    int i, c, mx=0, imx;

    vz[1]=1; b[1]=a[1]; m=1; nr[1]=1;

    for (i=2; i<=n; ++i)
    {
        c=cauta(a[i]);
        vz[i]=c;
        b[c]=a[i];
        nr[c]++;
        if (m<c) ++m;
    }

    for (i=1; i<=m; ++i)
        if (nr[i]>mx)
        {
            mx=nr[i];
            imx=i;
        }
    g<<mx<<"\n";
    for (i=1; i<=n; ++i)
        if (vz[i]==imx) g<<a[i]<<" ";
}

int main()
{
    Citeste();
    Solve();
    f.close();
    g.close();
    return 0;
}