#include <iostream>
#include<fstream>
using namespace std;
int v[100001],i,n,j,k,b[100001];
ifstream f("scmax.in");
ofstream g("scmax.out");
void rez()
{
    unsigned int max,ok,x=0;

    for(i=1;i<=n;i++)
    {
        max=0;
        for(j=1;j<i;j++)
            if(v[j]<v[i]&&b[j]>max)
            max=b[j];
        b[i]=max+1;
        if(x<max)
            x=max;
    }
    max=0;
    g<<x<<endl;
    for(i=1;i<=n;i++)
         if(max<b[i])
        {
g<<v[i]<<" ";
            max=b[i];
        }
}
int main()
{

    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    rez();
    return 0;
}