#include<fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int p,u,mid,v[100001],t[100001],w[100001],i,nr,n;
int main(){
    fin>>n;
    for(i=1;i<=n;i++){
        fin>>v[i];
    }
    t[1]=0;
    w[1]=1;
    nr=1;
    for(i=2;i<=n;i++){
        if(v[w[nr]]<v[i]){
            t[i]=t[w[nr]];
            nr++;
            w[nr]=i;
        }else{
            p=1;
            u=nr;
            while(p<=u){
                mid=(p+u)/2;
                if(v[w[mid]]>v[i]){
                    u=mid-1;
                }
                if(v[w[mid]]<=v[i]){
                    p=mid+1;
                }
            }
            w[p]=i;
            t[i]=w[p-1];
        }
    }
    fout<<nr<<"\n";
    for(i=1;i<=nr;i++){
        fout<<v[w[i]]<<" ";
    }
    return 0;
}