#include <fstream>
#define dim 100002

using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int w[dim],v[dim],t[dim],i,j,maxim,n,p,maxi=1,u,mid,nr;
void drum(int poz){
    if(t[poz]!=0)
        drum(t[poz]);
    fout<<v[poz]<<" ";
}
int main(){
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>v[i];
    w[1]=1;
    nr=1;
    for(i=2;i<=n;i++){
        if(v[i]>v[w[nr]]){
            nr++;
            w[nr]=i;
            t[i]=w[nr-1];
        }
        else{
            p=1;u=nr;
            while(p<=u){
                mid=(p+u)/2;
                if(v[i]>v[w[mid]])
                    p=mid+1;
                else
                u=mid-1;
            }
            if(v[i]>v[w[p-1]]){
                w[p]=i;
                t[i]=w[p-1];
            }
        }
    }
    fout<<nr<<endl;
    drum(w[nr]);
    fin.close();fout.close();
    return 0;
}