#include <fstream>
using namespace std;
ifstream f("scmax.in");
ofstream g("scmax.out");
int n,i,j,maxim,u,k,t[1000003],v[1000003],tt[1000003],x[1000003];
int main()
{
    f>>n;
    f>>v[1];
    t[1]=1;
   // maxim=v[1];
    v[n+1]=2000000001;
    for(i=2;i<=n+1;i++)
    {
        f>>v[i];
        maxim=0;
        for(j=1;j<i;j++)
        {
            if(v[i]>v[j]&&t[j]>maxim)
            {
                maxim=t[j];
                tt[i]=j;
            }
        }
        t[i]=maxim+1;
    }
    g<<t[n+1]-1<<'\n';
    u=n+1;
    while(t[u]!=0)
    {
        u=tt[u];
        x[++k]=v[u];
    }
    for(i=k-1;i>=1;i--)
    g<<x[i]<<" ";
    return 0;
}