#include <iostream>
#include <fstream>
using namespace std;
int v[100001],p[100001],q[100001],ans[100001];
int main()
{
    ifstream fin ("scmax.in");
    ofstream fout ("scmax.out");
    int n,i,j,k=0,sf,st,dr,mij,sol;
    fin>>n;
    for(i=1;i<=n;i++)
        fin>>v[i];
    sf=1;
    q[1]=v[1];
    p[1]=1;
    for(i=2;i<=n;i++)
    {
        st=1;
        dr=sf;
        sol=0;
        while(st<=dr)
        {
            mij=(st+dr)/2;
            if(q[mij]>=v[i]){
                dr=mij-1;
                sol=mij;
            }
            else
            st=mij+1;
        }
        if(sol!=0)
        {
            q[sol]=v[i];
            p[i]=sol;
        }
        else
        {
            sf++;
            q[sf]=v[i];
            p[i]=sf;
        }
    }
    for(i=n;i>0;i--)
    {
        if(p[i]==sf)
        {
            ans[++k]=v[i];
            sf--;
        }
    }
    fout<<k<<"\n";
    for(i=k;i>0;i--)
        fout<<ans[i]<<" ";
    return 0;
}