#include <fstream>
using namespace std;

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

int v[100010], s[100010], n, lmax, j, i;

int main()
{
    fin>>n;
    for(i=0; i<n; i++)
    {
        fin>>v[i];
        j=1;
        while(s[j] < v[i] && j <= lmax)
            j++;
        s[j] = v[i];
        if(j > lmax)
            lmax=j;
    }

    fout<<lmax<<'\n';
    for(i=1; i<=lmax; i++)
        fout<<s[i]<<" ";

    fin.close();
    fout.close();
    return 0;
}