#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 p[NMAX];
    int n;
    fin>>n;
    for(int i=1;i<=n;i++)
        fin>>a[i];

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

        }

    }

    fout<<k<<'\n';


    vector<int> sol;
    int c = k;
    for(int i=n;i>=1;i--)
    {
        if(p[i] == c)
        {
            c--;
            sol.push_back(a[i]);
        }
    }
    reverse(sol.begin(),sol.end());
    for(int i=0;i<sol.size();i++)
    {
        fout<<sol[i]<<" ";
    }

    return 0;

}