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