#include <fstream>
using namespace std;

ifstream fin("scmax.in");
ofstream fout("scmax.out");

int d[100010],cnt,st,dr,mid,t[100010],v[100010],n,i;

void sol(int x){
    if(t[x])
        sol(t[x]);
    fout<<v[x]<<" ";
}

int main(){
    fin>>n;
    for(i=1;i<=n;i++){
        fin>>v[i];

        st=1; dr=cnt;
        while(st<=dr){
            mid=(st+dr)/2;

            if(v[i]>v[d[mid]])
                st=mid+1;
            else
                dr=mid-1;
        }

        if(st==cnt+1)
            cnt++;

        d[st]=i;
        t[i]=d[st-1];
    }

    fout<<cnt<<"\n";
    sol(d[cnt]);

    return 0;
}