#include <fstream>

using namespace std;
ifstream in("scmax.in");
ofstream out("scmax.out");
int v[100001],lg[100001],n,lgmax,st,dr,mij,pred[100001],cur;
int main()
{
    in>>n;
    for(int i=1;i<=n;i++)
    {
        in>>v[i];
    }

    for(int i=1;i<=n;i++)
    {
        st=1,dr=lgmax;

        while(st<=dr)
        {
            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;
}