#include <fstream>
using namespace std;
int n,i,st,dr,mid,L,V[100010],t[100010],D[100010];
ifstream fin("scmax.in");
ofstream fout("scmax.out");
void T(int i)
{
    if(i!=0)
    {
        T(t[i]);
        fout<<V[i]<<" ";
    }
}
int main() {
    fin>>n;
    for (i=1;i<=n;i++)
        fin>>V[i];
    L=1;
    D[1]=1;
    for(i=2;i<=n;i++)
    {
        st=1;
        dr=L;
        while(st<=dr)
        {
            mid=(st+dr)/2;
            if(V[D[mid]]>=V[i])
                dr=mid-1;
            else
                st=mid+1;
        }
        if(st>L)
        {
            L++;
            D[L]=i;
            t[i]=D[st-1];
        }
        else
        {
            D[st]=i;
            t[i]=D[st-1];
        }
    }
    fout<<L<<"\n";
    T(D[L]);
    return 0;
}