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

using namespace std;


int main()
{
  int n;
  cin >> n;
  vector<string> s(n, string(n, '.'));
  for (int i = 0; i < n; ++i)
  {
    for (int j = 0; j < n; ++j)
    {
      int tmp = i + j;
      if (n - 2 <= tmp && tmp <= n) s[i][j] = '#';
    }
  }
  for (int i = 0; i < n; ++i) cout << s[i] << endl;
}