#include <fstream>
#include <algorithm>
using namespace std;
ifstream fin("scmax.in");
ofstream fout("scmax.out");
int v[1000000], poz[1000000], len[1000000];
int i, j, n;
int main()
{
    fin>>n;
    for(i=1;i<=n;i++)
    {
        fin>>v[i];
        len[i]=1;
    }
    i=0;
    for(i=n-1;i>=1;i--)
    {
        for(j=i+1;j<=n;j++)
        {
            if(v[i]<v[j]&&len[i]<len[j]+1)
            {
                len[i]=len[j]+1;
                poz[i]=j;
            }
        }
    }
    int x;
    x=max_element(len+1, len+n+1)-len;
    fout<<*(x+len)<<'\n';
    while(len[x]!=0)
    {
        fout<<v[x]<<' ';
        x=poz[x];
    }
    fin.close();
    fout.close();
    return 0;
}