#include <iostream>
#include <fstream>

using namespace std;

int v[100001], d[100001];

int main()
{
    ifstream cin("scmax.in");
    ofstream cout("scmax.out");
    int n, i, st, dr, mij, k = 1, poz;
    cin >> n;
    for(i = 1; i <= n; i++)
    {
        cin >> v[i];
    }
    d[1] = v[1];
    for(i = 2; i <= n; i++)
    {
        if(v[i] > d[k])
        {
            k++;
            d[k] = v[i];
        }
        else
        {
            st = 1;
            dr = k;
            poz = k + 1;
            while(st <= dr)
            {
                mij = (st + dr) / 2;
                if(d[mij] >= v[i])
                {
                    poz = mij;
                    dr = mij - 1;
                }
                else
                {
                    st = mij + 1;
                }
            }
            d[poz] = v[i];
        }
    }
    cout << k << "\n";
    for(i = 1; i <= k; i++)
    {
        cout << d[i] << " ";
    }
    return 0;
}