#include<iostream>
#include<fstream>
#include<vector>
using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int n;
vector<int> v,ans;

int main()
{
    f>>n;
    for(int i=1;i<=n;i++)
    {
        int x;
        f>>x;
        v.push_back(x);
    }
    for(int i=0;i<n;i++)
    {
        auto it = lower_bound(ans.begin(), ans.end(), v[i]);
         if (it == ans.end()) {
            ans.push_back(v[i]);
        }
        else 
        {
            *it = v[i];
        }
    }
    g<<ans.size()<<"\n";
    for(int i=0;i<ans.size();i++)
        g<<ans[i]<<" ";
}