#include <fstream>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int n,pmax,Max,k=1;
int v[100001],st[100001],tata[100001],sol[100001],l[100001];

int caut(int x)
{
    int p=1,q=k;
    while(p<=q)
    {
        int mid=(p+q)/2;
        if(v[st[mid]]>=x)
            q=mid-1;
        else
            p=mid+1;
    }
    return p;
}

int main()
{
   fin>>n;
   for(int i=1;i<=n;i++)
        fin>>v[i];
    st[1]=1;
    Max=k;
    for(int i=2;i<=n;i++)
    {
        int pc=caut(v[i]);
        st[pc]=i;
        k=max(k,pc);l[i]=k;
        tata[i]=st[pc-1];
    }
    for(int i=1;i<=n;i++)
        if(l[i]>Max)
            Max=l[i],pmax=i;
    fout<<Max<<'\n';
    int k=1;
    sol[1]=v[pmax];
    while(tata[pmax]!=0)
    {
        pmax=tata[pmax];
        sol[++k]=v[pmax];
    }
    for(int i=Max;i>=1;i--)
        fout<<sol[i]<<' ';
   return 0;
}