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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];
    int dr=0,m,st;
    for(int i=1; i<n; i++)
    {
        bool ok=0;
        st=0;
        if(v[i]>sir[dr])
        {
            dr++;
            best[i]=dr;
            sir[dr]=v[i];
        }
        else
        {
            while(st<dr)
            {
                m=(st+dr)/2;
                if(sir[m]==v[i])
                {
                    best[i]=m;
                    ok=1;break;
                }
                else
                {
                    if(sir[m]>v[i])
                    {
                        dr=m-1;
                    }
                    else
                    {
                        st=m+1;
                    }
                }
            }
        }
       if(ok==0)
       {
           if(v[i]<sir[st])
           {
               sir[st]=v[i];
               best[i]=st;
           }
       }
    }
    for(int i=0; i<n-1; i++)
    {
        
    }
    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;
}