#include <bits/stdc++.h>
using namespace std;

ifstream fin("scmax.in");
ofstream fout("scmax.out");

vector <int> v, t;

void afisare(int nr)
{
    if(t[nr] != 0)
    {
        afisare(t[nr]);
        fout<<v[nr]<<" ";
    }
    else
        fout<<v[nr]<<" ";
}

int CB( vector<int> v, int st, int dr, int nr)
{
    while(dr-st > 1)
    {
        int m = (st+dr)/2;
        if(v[m] > nr)
            dr=m;
        else
         if(v[m] < nr)
            st=m;
         else
            if(v[m] == nr)
                return m;
    }
    return dr;
}

int main()
{
    int l=1, n, x;

    fin>>n;
    v.resize(n+1);
    t.resize(n+1);

    for(int i=1; i<=n; i++)
    {
        fin>>x;
        if(x < v[0])
            v[0] = x;
        else
            if(x > v[l-1])
            {
                t[l] = l-1;
                v[l++] = x;
            }
        else
        {
            int k = CB(v, -1, l-1, x);
            v[k] = x;
            t[k] = k-1;
        }
    }

    fout<<l-1<<"\n";
    afisare(l-1);

    return 0;
}