#include <bits/stdc++.h>
using namespace std;
int main() {
  ios_base::sync_with_stdio(false);
  cin.tie(nullptr);
  int n, m;
  cin >> n >> m;
  for (int i = 1; i <= n; i++) {
    if (i % 2 == 1) {
      for (int j = 1; j <= m; j++) {
        cout << "#";
      }
      cout << "\n";
    } else if (i % 2 == 0 && i % 4 != 0) {
      for (int j = 1; j < m; j++) {
        cout << ".";
      }
      cout << "#\n";
    } else if (i % 4 == 0) {
      cout << "#";
      for (int j = 2; j <= m; j++) {
        cout << ".";
      }
      cout << "\n";
    }
  }
}
