#include <iostream>
#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,x,v[100001],i,j,m;
int main()
{
    f>>n;
    for(i=1; i<=n; i++){ f>>x;
                         j=1;
                         while(x>v[j] && j<=m)j++;
                         v[j]=x;
                         m=max(m,j);
                       }
    g<<m<<endl;
    for(i=1; i<=m; i++)g<<v[i]<<" ";
    g<<endl;
    return 0;
}