#include <iostream>
#include <fstream>
using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int n,a[100005];
int m,sir[100005];
int bacK[100005];
int sol[100005],q;
int main()
{
    in>>n;
    for(int i=1;i<=n;i++)
    {
        in>>a[i];///citire
        int x=0;
        for(int j=1<<30;j>0;j/=2)
        {
            if(x+j<=m && a[sir[x+j]]<a[i])
            {
                x+=j;
            }
        }
        x++;
        if(m+1==x)
        {
            m++;
        }
            sir[x]=i;
            bacK[i]=sir[x-1];
    }
    int t=sir[m];
    while(t>0)
    {
        sol[++q]=a[t];
        t=bacK[t];
    }
    out<<q<<'\n';
    for(int i=q;i>0;i--)out<<sol[i]<<' ';
    return 0;
}