#include <iostream>
#include <fstream>
using namespace std;
ifstream fin ("scmax.in");
ofstream fout ("scmax.out");
int n,k,st,dr,i,m,p,nr,z,a[100001],b[100001],v[100001],c[100001];
int main()
{
    fin >>n;
    k=0;
    for (i=1;i<=n;i++)
    {
        fin >>v[i];
        st=1;dr=k;p=0;
        while (st<=dr)
        {

            m=(st+dr)/2;
            if(v[i]<=a[m])
            {
                p=m;
                dr=m-1;
            }
            else
            {
                st=m+1;
            }
        }
        if(p!=0){
            a[p]=v[i];
            b[i]=p;
        }
        else
        {
            k++;
            a[k]=v[i];
            b[i]=k;
        }
    }
    z=n;
    fout<<k<<'\n';
    while(k>0)
    {
        for(i=n;i>=0;i--)
            if(b[i]==k)
            {
                c[++nr]=v[i];
                break;
            }
        k--;
        z=n;
    }
    for(i=nr;i>0;i--)
        fout <<c[i]<<" ";
    return 0;
}