#include <bits/stdc++.h>
using namespace std;
int main() {
  int n, m;
  cin >> n >> m;
  for (int i = 1; i <= n; ++i) {
    if (i % 2 != 0) {
      for (int i = 0; i < m; ++i) {
        cout << "#";
      }
      cout << endl;
    } else if (i % 2 == 0 && i % 4 != 0) {
      for (int i = 0; i < m - 1; ++i) {
        cout << ".";
      }
      cout << "#" << endl;
    } else {
      cout << "#";
      for (int i = 0; i < m - 1; ++i) {
        cout << ".";
      }
      cout << endl;
    }
  }
  return 0;
}
