#include <fstream>
using namespace std;
ifstream cin("scmax.in");
ofstream cout("scmax.out");

#define nmax 100010

int n,maxim1,ind1,maxim2,ind2,x,y;
int v[nmax],p[nmax],t[nmax],pre[nmax];

int main()
{
    int i,j;
    cin>>n;
    cin>>v[1];
    y=v[1];
    for (i=2;i<=n;i++)
    {
        cin>>x;
        if (x==y) continue;
        v[++v[0]]=x;
        maxim1=0;
        for (j=v[0]-1;j;j--)
            if (v[v[0]]>v[j])
            {
                if (p[j]>maxim1)
                {
                    maxim1=p[j];
                    ind1=j;
                }
            }
        p[v[0]]=maxim1+1;
        pre[v[0]]=ind1;
        if (p[v[0]]>maxim2)
        {
            maxim2=p[v[0]];
            ind2=v[0];
        }
        y=x;
    }
    j=ind2;
    do
    {
        t[++t[0]]=j;
        j=pre[j];
    }while(j);
    cout<<t[0]<<'\n';
    for (i=t[0];i;i--)
        cout<<v[t[i]]<<" ";
}