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#include <iostream>
#include <fstream>
#include <vector>
using namespace std;
int main()
{
    ifstream f("scmax.in");
    ofstream g("scmax.out");
    int n;
    f>>n;
    vector<int> v(n), best(n), sir(n);
    for(int i=0; i<n; i++)
    {
        f>>v[i];
    }
   /* for(int i=0; i<n-1; i++)
    {
        for(int j=i+1; j<n; j++)
        {
            if(v[i]<v[j])
            {
               best[j] = max(best[j], best[i] + 1);
            }
        }
    }*/
     sir[0] = v[0];
    best[0] = 0;
    int dr = 0;

    for(int i=1; i<n; i++)
    {
        int st = 0, dr2 = dr, m;
        bool ok = 0;

        if(v[i] > sir[dr])
        {
            dr++;
            sir[dr] = v[i];
            best[i] = dr;
        }
        else
        {
            while(st <= dr2)
            {
                m = (st + dr2)/2;
                if(sir[m] >= v[i])
                {
                    dr2 = m - 1;
                }
                else
                {
                    st = m + 1;
                }
            }

            // st = poziția unde trebuie pus v[i]
            if(st > dr)
            {
                dr++;
                sir[dr] = v[i];
                best[i] = dr;
            }
            else
            {
                sir[st] = v[i];
                best[i] = st;
            }
        }
    }

    int aux=0;
    for(int i=0; i<n; i++)
    {
        if(aux<best[i])
        {
            aux=best[i];
        }
    }
    g<<aux+1<<endl;
    vector<int> v2;
    for(int i=n-1; i>=0; i--)
    {
        if(best[i]==aux)
        {
            v2.push_back(v[i]);
            aux--;
        }
    }
    for(int i=v2.size()-1; i>=0; i--)
    {
        g<<v2[i]<<" ";
    }

    return 0;
}