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