#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,m,mx=0,v[100001],a[1000001],b[30001];
int main()
{
    int i,j;
    fin>>n;
    for(i=1;i<=n;i++)
    {
    mx=0;
        fin>>v[i];
        for(j=1;j<i;j++)
        {
            if(v[i]>v[j])
            {
                mx=max(mx,a[j]);
                b[mx]=v[j];
            }
        }
        a[i]=1+mx;
        b[a[i]]=v[i];
    }
    fout<<a[n]<<endl;
    for(i=1;i<=a[n];i++)
    {
    fout<<b[i]<<" ";
    }
    return 0;
}