#include<fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,m,i,j,k,st,dr,mid,r;
int v[100005],d[100005],sol[100005],t[100005];
int main(){
    fin>>n;
    for(i=1;i<=n;i++){
        fin>>v[i];
    }
    d[1]=1;
    k=1;
    for(i=2;i<=n;i++){
        ///cautare binara in d
        ///caut cea mai mare valoare mai mica decat v[i]
        st=1;
        dr=k;
        while(st<=dr){
            mid=(st+dr)/2;
            if(v[d[mid]]>=v[i]){
                dr=mid-1;
            }
            else{
                st=mid+1;
            }
        }
        if(st>k){
            k++;
            d[k]=i;
            t[i]=d[st-1];
        }
        else{
            d[st]=i;
            t[i]=d[st-1];
        }
    }
    int q=d[k];
    sol[++r]=d[k];
    while(t[q]!=0){
        q=t[q];
        sol[++r]=q;
    }
    sol[++r]=q;
    fout<<k<<"\n";
    for(i=1;i<=k;i++){
        fout<<v[sol[k-i+1]]<<" ";
    }
    return 0;
}