#include <iostream>
#include <fstream>
#define inf 2000000
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int dmax,v[100001],d[100001],t[100001],n,i,poz;
int caut (int x)
{
    int st=1,dr=dmax,mid;
    while(st<=dr)
    {
        mid=(st+dr)/2;
        if(x<=v[d[mid]])
            dr=mid-1;
        else
            st=mid+1;
    }
    return st ;
}
void sol(int x)
{
    if(x!=0)
    {
        sol(t[x]);
        fout<<v[x]<<" ";
    }
}
int main()
{
    fin>>n;
    fin>>v[1];
    d[1]=dmax=1;
    for(i=2; i<=n; i++)
    {
        fin>>v[i];
        poz=caut(v[i]);
        if(poz>dmax)
        {
            dmax++;
        }
        d[poz]=i;
        t[i]=d[poz-1];
    }
    fout<<dmax<<"\n";
    sol(d[dmax]);
}