#include <bits/stdc++.h>
using namespace std;
int main() {
  int h, m;
  cin >> h >> m;
  while (h != 0 || m != 0) {
    for (int i = 1; i <= h; i++) {
      if ((i % 2) == 1) {
        int j = 0;
        while (true) {
          cout << "#";
          j++;
          if (j >= m) break;
          cout << ",";
          j++;
          if (j >= m) break;
        }
      } else if ((i % 2) == 0) {
        int j = 0;
        while (true) {
          cout << ",";
          j++;
          if (j >= m) break;
          cout << "#";
          j++;
          if (j >= m) break;
        }
      }
    }
    cin >> h >> m;
  }
}
