#include <iostream>
#include <cstdio>
#define N 100005

using namespace std;

int n, a[N], s1[N], s2[N], lg;

int caut(int x, int st, int dr)
{
   if(st==dr)
   {
       if(s1[st]>=x)
            return st;
       return -1;
   }
   int mij=(st+dr)/2;
   if(s1[mij]<x)
      return caut(x, mij+1, dr);
   return caut(x, st, mij);
}

void citire()
{
    scanf("%d\n", &n);
    scanf("%d ", &a[1]);
    s1[++s1[0]]=a[1];
    s2[1]=1;
    for(int i=2;i<=n;i++)
    {
        scanf("%d ", &a[i]);
        int poz=caut(a[i], 1, s1[0]);
        if(poz==-1)
        {
            s1[++s1[0]]=a[i];
            s2[i]=s1[0];
        }
        else
        {
            s1[poz]=a[i];
            s2[i]=poz;
        }
    }
}

void subsir(int i)
{
    if(i==0)
        return;
    if(s2[i]==lg)
    {
        lg--;
        subsir(i-1);
        printf("%d ", a[i]);
    }
    subsir(i-1);
}

int main()
{
    freopen("scmax.in", "r", stdin);
    freopen("scmax.out", "w", stdout);

    citire();
    printf("%d\n", s1[0]);
    lg=s1[0];
    subsir(n);
    return 0;
}