#include <iostream>
#include<fstream>
#define l 100001
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");

int lg[l], k, n, v[l], p[l], sol[l], nr;
int main()
{
    f>>n;
    for(int i=1; i<=n; i++)
        f>>v[i];

    lg[1]=v[1], p[1]=1, k=1;
    for(int i=2; i<=n; i++)
        if(v[i]>lg[k])
            lg[++k]=v[i], p[i]=k;
        else
        {
            int st=1, dr=k, poz=k+1;
            while(st<=dr)
            {
                int m=(st+dr)/2;
                if(v[i]<lg[m])
                    poz=m, dr=m-1;
                else st=m+1;
            }
            lg[poz]=v[i], p[i]=poz;
        }

    g<<k<<"\n";
    int i=n;
    for(int j=k; j>=1; j--)
    {
        while(p[i]!=j)
            i--;
        sol[++nr]=v[i];
    }
    for(int i=nr; i>=1; i--)
        g<<sol[i]<<" ";
    return 0;
}