#include <bits/stdc++.h>

using namespace std;

int main()
{
    ifstream fin("scmax.in");
    ofstream fout("scmax.out");
    long long int v[2000000001],l[2000000001],i,k,n,lmax,lf[2000000001],a=0;
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
    }
    
    for(k=1;k<=n;k++)
    {
        l[k]=1;
        for(i=1;i<k;i++)
        {
            if(v[i]<v[k])
            {
                if(l[i]+1>l[k])
                {
                    l[k]++;
                }
            }
        }
    }
    
    lmax = *max_element(l+1,l+n+1);
    fout<<lmax<<endl;
    
    i=n;
    while(i>0)
    {
        if(l[i]==lmax)
        {
            lmax--;
            a++;
            lf[a]=v[i];
            
        }
        i--;
    }
    
    for(i=a;i>=1;i--)
    {
        fout<<lf[i]<<" ";
    }
}