#include <iostream>
#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,d[10100],p,a[10100],v[10100];
int bsh(int x){
    int st=1,dr=p;
    while(st<=dr){
        int mid=(st+dr)/2;
        if(v[d[mid]]>=x)
            dr=mid-1;
        else
            st=mid+1;
    }
    return st;

}
void afisare(int p2){
    if(a[p2])
        afisare(a[p2]);
    fout<<v[p2]<<" ";

}
int main(){
    fin>>n;
    for(int i=1;i<=n;i++)
        fin>>v[i];
    d[1]=1;
    p=1;
    for(int i=2;i<=n;i++){
        int ps=bsh(v[i]);
        if(ps>p)
            d[++p]=i;
        else
            d[ps]=i;

        a[i]=d[ps-1];

    }
    fout<<p<<"\n";
    afisare(d[p]);
    return 0;
}