#include<fstream>
using namespace std;
int i, n, x[100003], t[100003], d[100003], p, u, mij, k;
ifstream in("scmax.in");
ofstream out("scmax.out");
void drum(int k){
    if(k!=0){
        drum(t[k]);
        out<<x[d[k]]<<" ";
    }
}
int main(){
    in>>n;
    for(i=1; i<=n; i++)
        in>>x[i];
    for(i=1; i<=n; i++){
        p=1; u=k;
        while(p<=u){
            mij=p+(u-p)/2;
            if(x[i]<=x[d[mij]])
                u=mij-1;
            else
                p=mij+1;
        }
        if(p>k){
            d[++k]=i;
            t[k]=p-1;
        }
        else{
            if(x[i]<x[d[p]]){
                d[p]=i;
                t[i]=p-1;
            }
        }
    }
    out<<k<<"\n";
    drum(k);
return 0;
}