#include<fstream>

using namespace std;

ifstream cin("scm.in");
ofstream cout("scm.out");

int sol[200010],n,poz[200010],nrmax,v[200010],sol2[200010];

int main () {
cin>>n;
for(int i=1;i<=n;i++)
    cin>>v[i];
sol[1]=v[1];
nrmax=1;
poz[1]=1;
for(int i=2;i<=n;i++){
    int st=1,dr=nrmax,pozc=-1;
    while(st<=dr){
        int mij=(st+dr)/2;
        if(v[i]>sol[mij])
            st=mij+1;
        else{
            pozc=mij;
            dr=mij-1;
        }
    }
    if(pozc==-1){
        nrmax++;
        sol[nrmax]=v[i];
        poz[i]=nrmax;
    }
    else{
        sol[pozc]=v[i];
        poz[i]=pozc;
    }
}
cout<<nrmax<<endl;
int counter=nrmax,nr=0;
for(int i=n;i>0;i--)
    if(poz[i]==counter){
        nr++;
        sol2[nr]=v[i];
        counter--;
    }
for(int i=nrmax;i>0;i--)
    cout<<sol2[i]<<" ";


return 0;
}