#include <bits/stdc++.h>

using namespace std;

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

#define NMAX 100005

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

    int k = 1;
    b[k] = a[1];
    for(int i=2;i<=n;i++)
    {
        if(a[i] > b[k])
        {
            b[++k] = a[i];
        }
        else
        {
            int st = 1;
            int dr = k;
            int poz = dr+1;


            while(st<=dr)
            {
                int m = (st+dr)/2;
                if(b[m] > a[i])
                {
                    poz = m;
                    dr = m-1;
                }
                else
                {
                    st = m+1;
                }

            }
            b[poz] = a[i];


        }
    }

    fout<<k<<'\n';
    for(int i=1;i<=k;i++)
        fout<<b[i]<<" ";


    return 0;
}