#include <bits/stdc++.h>

using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int n,a[100100],v[100100],k,poz[100100],m,s[100100],up[100100],p,Max;
void afis(int p)
{
    if(p==poz[p]) {
        out<<a[p]<<" ";
        return;
    }
    else
    {
        afis(poz[p]);
        out<<a[p]<<" ";
    }
}
int main()
{
    in>>n;
    for(int i=1;i<=n;i++) in>>a[i];
    for(int i=1;i<=n;i++)
    {
        if(k==0) v[++k]=a[i],up[k]=1,poz[i]=1;
        else
        {
           if(a[i]<=v[1]) v[1]=a[i],poz[i]=i,up[1]=i;
           else if(a[i]>v[k]) v[++k]=a[i],poz[i]=up[k-1],up[k]=i;
           else
           {
               int st=1;
               int dr=k;
               p=0;
               while(st<=dr)
               {
                   m=(st+dr)/2;
                   if(v[m]<a[i])
                   {
                       p=m;
                       st=m+1;
                   }
                   else dr=m-1;
               }
               v[p+1]=a[i];
               poz[i]=up[p];
               up[p+1]=i;
           }
        }
    }
    out<<k<<'\n';
    afis(up[k]);
    return 0;
}