#include <fstream>
using namespace std;

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

int n,i,j,m,p,k,u,t[100010],sol[100010],v[100010],d[100010],cnt,st,dr,mid;

int main(){
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>v[i];
    v[++n]=2000001110;

    for(i=1;i<=n;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)
            cnt++;

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

    fout<<cnt-1<<"\n";
    u=n;
    while(u!=0){
        sol[++k]=v[u];
        u=t[u];
    }

    ///fout<<k-1<<"\n";
    for(;k>=2;k--){
        fout<<sol[k]<<" ";
    }

    return 0;
}