#include<fstream>
using namespace std;
const int NMAX=100005;
int v[NMAX],t[NMAX],p[NMAX],vn[NMAX];
int main()
{
    ifstream cin("scmax.in");
    ofstream cout("scmax.out");
    int n,k,maxx=-1;
    cin>>n;
    for(int i=1;i<=n;++i)
    {
        cin>>v[i];
        t[i]=1;
    }
    for(int i=1;i<=n;++i)
        for(int j=1;j<i;++j)
        {
             if(v[j]<v[i])
                if(t[j]+1>=t[i])
                {
                    p[i]=j;
                    t[i]=t[j]+1;
                }

        }
    for(int i=1;i<=n;++i)
        if(t[i]>maxx)
        {
            maxx=t[i];
            k=i;
        }
    cout<<maxx<<endl;
    for(int i=maxx;i>=1;--i)
    {
        vn[i]=v[k];
        k=p[k];
    }
    for(int i=1;i<=maxx;++i)
        cout<<vn[i]<<" ";
}