#include<fstream>
using namespace std;

ifstream f("scmax.in");
ofstream g("scmax.out");

int v[100001],sol[100001],zis[100001],n;

void calc(int x)
{
    int maxx=0,i;
    for(i=x;i<=n;i++)
        if(v[i]>v[x])
        {
            calc(i);
            if(sol[i]>maxx)
                maxx=sol[i];
        }
    sol[x]=1+maxx;
}

int main()
{
    int i,maxx=0;
    f>>n;
    for(i=1;i<=n;i++)
        f>>v[i];
    for(i=1;i<=n;i++)
        calc(i);
    for(i=1;i<=n;i++)
        if(sol[i]>maxx)
            maxx=sol[i];
    g<<maxx<<"\n";
    for(i=1;i<=n;i++)
    {
        if(sol[i]==maxx)
        {
            g<<v[i]<<" ";
            maxx--;
        }
    }
    return 0;
}