#include<fstream>
using namespace std;
int t[100007], n, p, sol, solp, i, nr, j, u, mij, v[100007], maxim, w[100007];
ifstream in("scmax.in");
ofstream out("scmax.out");
void afisare(int x){
    if(x!=0){
        afisare(t[x]);
        out<<v[x]<<" ";
    }
}
int main(){
    in>>n;
    for(i=1; i<=n; i++)
        in>>v[i];
    w[1]=1;
    nr=1;
    for(i=2; i<=n; i++){
        if(v[i]>v[w[nr]]){
            w[++nr]=i;
            t[i]=w[nr-1];
        }
        else{
            p=1; u=nr;
            while(p<=u){
                mij=p+(u-p)/2;
                if(v[i]>v[w[mij]])
                    p=mij+1;
                else
                    u=mij-1;
            }
            if(v[i]>v[w[p-1]]){
                w[p]=i;
                t[i]=w[p-1];
            }
        }
    }
    out<<nr<<"\n";
    afisare(w[nr]);
return 0;
}