#include <bits/stdc++.h>

using namespace std;
const int Nmax = 100000 + 5;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n, a[Nmax];
set <int>st;
int main()
{
    fin >> n;
    set <int> :: iterator it;
    for(int i = 1; i <= n; ++i)
    {
        fin >> a[i];
        it = st.upper_bound(a[i]);
        if(it == st.end())
            st.insert(a[i]);
        else
        {
            st.erase(it);
            st.insert(a[i]);
        }
        //for(auto i : st)
        //fout << i << " ";
       // fout << '\n';
    }
    fout << st.size() << '\n';
    for(auto i : st)
        fout << i << " ";
    return 0;
}