#include <iostream>
#include <fstream>
#define nmax 100001
using namespace std;

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

int v[nmax],n,l[nmax],c[nmax],xmax;


inline void solve()
{
    for(int i=2;i<=n;++i)
    {
        l[i]=1;
        for(int j=1;j<i;++j)
        {
            if(v[i]>v[j])
                if(l[i]<l[j]+1)
                {
                    l[i]=l[j]+1;
                    c[i]=j;
                }
        }
        if(l[i]>l[xmax])xmax=i;
    }
}
inline void read()
{
    f>>n;
    for(int i=1;i<=n;++i)f>>v[i];
    l[1]=1;
}
void write(int x)
{
    if(c[x]!=0)
    {
        write(c[x]);
    }
    g<<v[x]<<" ";
}
int main()
{
    read();
    solve();
    g<<l[xmax]<<"\n";
    write(xmax);
    return 0;
}