#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 j = 1; j <= m; j++) cout << "#";
      cout << endl;
    } else {
      if (i % 4 != 0) {
        for (int j = 1; j < m; j++) cout << ".";
        cout << "#";
      }
      if (i % 4 == 0) {
        cout << "#";
        for (int j = 2; j <= m; j++) cout << ".";
      }
      cout << endl;
    }
  }
  return 0;
}
