#include <iostream>
#include <fstream>
using namespace std;
int n,v[666];
ifstream f("scmax.in");
ofstream g("scmax.out");
void rezolvare(int n,int v[])
{
    int i,j,q[666],m=1;
    for(i=1;i<=n;i++)
    {
        for(j=1;j<=m;j++)
        {
            if(v[i]<q[j])
            {
                 q[j]=v[i];
                 break;
            }
            if(v[i]>q[m])
            {
                m=m+1;
                q[m]=v[i];
                break;
            }
        }
    }
    g<<m<<'\n';
    for(j=1;j<=m;j++)
        g<<q[j]<<" ";
}
int main()
{
    int i;
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    rezolvare(n,v);

    return 0;
}