#include <fstream>
using namespace std;

ifstream cin("scmax.in");
ofstream cout("scmax.out");
int v[100001],l[100001],d[100001],rez[100001];
int main ()
{
    int k=0, n, i, st, dr, m, ck, poz;
    cin>>n;
    for (i=1; i<=n; i++)
    {
        cin>>v[i];
        if (v[i]>l[k])
        {
            k++;
            l[k]=v[i];
            d[i]=k;
        }
        else
        {
            st=1;
            dr=k;
            while (st<=dr)
            {
                m=(st+dr)/2;
                if (l[k]>=v[i])
                {
                    poz=k;
                    dr=m-1;
                }
                else
                    st=m+1;
            }
            l[poz]=v[i];
            d[i]=poz;
        }
    }
    cout<<k<<'\n';
    ck=k;
    for (i=n; i>=1; i--)
        if (d[i]==ck)
        {
            rez[ck]=v[i];
            ck--;
        }
    for (i=1; i<=k; i++)
        cout<<rez[i]<<" ";
    return 0;
}