#include <iostream>
#include <fstream>
using namespace std;
int n,v[100005],lg[100005],pred[100005],lgmax;
ifstream in("scmax.in");
ofstream out("scmax.out");
int main()
{
    in>>n;
    for(int i=1;i<=n;i++) in>>v[i];
    for(int i=1;i<=n;i++)
    {
        int st=1, dr=lgmax;
        while(st<=dr)
        {
            int mij=(st+dr)/2;
            if(v[lg[mij]]<v[i]) st=mij+1;
            else dr=mij-1;
        }
        if(st>lgmax) lgmax++;
        lg[st]=i;
        pred[i]=lg[st-1];
    }
    out<<lgmax<<'\n';
    int poz=lgmax-1, cur=lg[lgmax];
    while(cur>0)
    {
        lg[poz]=pred[cur];
        cur=pred[cur];
        poz--;
    }
    for(int i=1;i<=lgmax;i++) out<<v[lg[i]]<<" ";
    return 0;
}