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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);
    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);
            }
        }
    }
    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;
}