#include <iostream>
#include <vector>
#include <algorithm>

using namespace std;

vector<string> cc = {
  "HED",
  "HDD",
  "EEH",
};

int main()
{
  int n;
  cin >> n;
  vector<string> ans(n, string(n, '.'));
  for (int i = 0; i < n; i += 3)
  {
    for (int j = 0; j < n; j += 3)
    {
      for (int k = 0; k < 3; ++k)
      {
        for (int l = 0; l < 3; ++l) ans[i + k][j + l] = cc[k][l];
      }
    }
  }
  for (int i = 3; i + 1 < n; i += 3) swap(ans[0][i], ans[1][i + 1]);
  for (int i = 0; i < n; ++i) cout << ans[i] << endl;
}