#include <iostream>
#include <fstream>
#define NMAX 100004
using namespace std;
int maxi, n, v[NMAX], p[NMAX], l[NMAX];
int cb (int x)
{
    int l1 = 0, l2 = maxi, pp = maxi;
    while (l1 <= l2)
    {
        int mid = (l1 + l2) / 2;
        if (v[l[mid]] < x)
        {
            pp = mid;
            l1 = mid + 1;
        }
        else l2 = mid - 1;
    }
    return pp;
}
int sol[NMAX];
int main ()
{
    ifstream cin ("scmax.in");
    ofstream cout ("scmax.out");
    cin >> n;
    for (int i = 1; i <= n; i++)
    {
        cin >> v[i];

    }
    int ps = 0;
    l[1] = v[1];
    for (int i = 1; i <= n; i++)
    {
        int lmax = cb(v[i]);
        l[lmax + 1] = i;
        p[i] = l[lmax];
        if (lmax + 1 > maxi){
            ps = i;
            maxi = lmax + 1;
        }
    }
    int nr = 0;
    cout << maxi << "\n";
    nr++;
    sol[nr] = v[ps];
    while (p[ps] != 0)
    {
        nr++;
        sol[nr] = v[p[ps]];
        ps = p[ps];
        
    }
    for (int i = maxi; i >= 1; i--)
        cout << sol[i] << " ";
    return 0;
}