#include <iostream>
#include <fstream>
#include <algorithm>
using namespace std;

int bun[100005], a[100000] ,sir2[100002];
int main()
{
    ifstream f("scmax.in");
    ofstream g("scmax.out");
    int n,mx=0,x=1;
    f >> n;
    for(int i=1;i<=n;++i)
    {
        f >> a[i];
    }
    bun[1]=1;
    for(int i=2;i<=n;++i)
    {
        bun[i]=1;

        for(int j=1;j<i;++j)
        {
            if(a[i]>a[j] && bun[i]<bun[j]+1)
            {
                bun[i]=1+bun[j];

            }
        }
        if(bun[i]>mx)
        {
            mx=bun[i];
        }
    }

    g << mx << "\n";
        int i=1;
    while(x<=mx)
    {
        if(bun[i]==x)
        {
            g << a[i] << " ";
            ++x;
        }
        ++i;
    }
    return 0;
}