#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int x[100005],z[100005],n,k=1;
void citire()
{
    fin>>n;
    for(int i=1; i<=n; i++)
        fin>>x[i];
}
void prelucrare()
{
    int i,j;
    z[1]=x[1];
    for(i=2; i<=n; i++)
    {
        j=1;
        while( x[i] > z[j] && j<k)
            j++;

        if(x[i]>z[j])
        {
            k++;
            z[k]=x[i];
        }
        else
        {
            z[j]=x[i];
        }
    }
}
void afisare()
{
    fout << k << "\n";
    for(int i=1; i<=k; i++)
        fout << z[i] << " ";
}
int32_t main()
{
    citire();
    prelucrare();
    afisare();
    return 0;
}