#include <bits/stdc++.h>

using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int n,v[100005],d[100005],p[100005];
int sol[100005];
void citire()
{
    f>>n;
    for(int i=1;i<=n;i++)
        f>>v[i];
}

void sclm()
{
    int k=1;
    d[k]=v[1];
    p[1]=1;
    for(int i=2;i<=n;i++)
    {
        if(v[i]>d[k])
            d[++k]=v[i],p[i]=k;
        else
        {
            int poz=k+1,st=1,dr=k;
            while(st<=dr)
            {
                int mij=(st+dr)/2;
                if(d[mij]>=v[i])
                    poz=mij,dr=mij-1;
                else
                    st=mij+1;
            }
            d[poz]=v[i];
            p[i]=poz;
        }
    }
    g<<k<<"\n";
    int j=n;
    for(int i=k;i>=1;i--)
    {
        while(p[j]!=i)
            j--;
        sol[i]=j;
    }
    for(int i=1;i<=k;i++)
        g<<v[sol[i]]<<" ";
}

int main()
{
    citire();
    sclm();
    return 0;
}