#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;

void drum(int nr) {
    if (nr != 0) {
        drum(t[nr]);
        fout<<v[nr]<<" ";
    }
}

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]=w[nr];
            nr++;
            w[nr]=i;
        }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<<"\n";
    drum(w[nr]);

    return 0;
}