#include <iostream>
#include <fstream>
#define MAXN 100001

using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[MAXN],se[MAXN],u[MAXN],rez[MAXN];
int main(){
    int n,speci,maxse=0;
    fin>>n;
    for(int i=1;i<=n;i++){
        fin>>v[i];
        se[i]=1;
        for(int j=1;j<i;j++){
            if(v[i]>v[j] and se[i]<se[j]+1){
                se[i]=se[j]+1;
                u[i]=j;
            }
        }
        if(se[i]>maxse) maxse=se[i],speci=i;
    }
    bool done=false;
    for(int i=speci;done==false;i=u[i]){
        rez[se[i]]=v[i];
        if(se[i]==1)
            done=true;
    }
    fout<<maxse<<'\n';
    for(int i=1;i<=maxse;i++){
        fout<<rez[i]<<' ';
    }
    return 0;
}