import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      }  
  }
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }

  }

} import java.io.BufferedReader; BufferedReader java.io import java.io.IOException; IOException java.io import java.io.InputStream; InputStream java.io import java.io.InputStreamReader; InputStreamReader java.io import java.io.PrintWriter; PrintWriter java.io import java.util.StringTokenizer; StringTokenizer java.util public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      }  
  }
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }

  }

} Main static InputReader in; in static PrintWriter out; out public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
} main {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
} in = new InputReader(System.in) in new InputReader(System.in) out = new PrintWriter(System.out) out new PrintWriter(System.out) Solution solver = new Solution(); solver new Solution() solver.solve() solver.solve solver out.close() out.close out String[] args args static class Solution {
    void solve() throws IOException {
      while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      }  
  }
} Solution void solve() throws IOException {
      while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      }  
  } solve {
      while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      }  
  } while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      } true {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      } int H = in.nextInt(); H in.nextInt() in.nextInt in int W = in.nextInt(); W in.nextInt() in.nextInt in if (H == 0 && W == 0) break; H == 0 && W == 0 H == 0 H 0 W == 0 W 0 break; for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        } int i = 0; int i = 0; i 0 i < H i H i++ i++ i {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        } {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        } if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          } i == 0 || i == H - 1 i == 0 i 0 i == H - 1 i H - 1 H 1 {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } for (int j = 0; j < W; j++) {
              out.print("#");
            } int j = 0; int j = 0; j 0 j < W j W j++ j++ j {
              out.print("#");
            } {
              out.print("#");
            } out.print("#") out.print out "#" out.print("\n") out.print out "\n" {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          } out.print("#") out.print out "#" for (int j = 1; j < W-1; j++) {
              out.print(".");
            } int j = 1; int j = 1; j 1 j < W-1 j W-1 W 1 j++ j++ j {
              out.print(".");
            } {
              out.print(".");
            } out.print(".") out.print out "." out.println("#") out.println out "#" out.print("\n") out.print out "\n" static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }

  } InputReader public BufferedReader br; br public StringTokenizer st; st public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    } InputReader {
      br = new BufferedReader(new InputStreamReader(stream));
    } br = new BufferedReader(new InputStreamReader(stream)) br new BufferedReader(new InputStreamReader(stream)) InputStream stream stream public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    } nextInt {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    } while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      } st == null || !st.hasMoreTokens() st == null st null !st.hasMoreTokens() st.hasMoreTokens() st.hasMoreTokens st {
        st = new StringTokenizer(br.readLine());
      } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return Integer.parseInt(st.nextToken()); Integer.parseInt(st.nextToken()) Integer.parseInt Integer st.nextToken() st.nextToken st public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    } nextLong {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    } while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      } st == null || !st.hasMoreTokens() st == null st null !st.hasMoreTokens() st.hasMoreTokens() st.hasMoreTokens st {
        st = new StringTokenizer(br.readLine());
      } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return Long.parseLong(st.nextToken()); Long.parseLong(st.nextToken()) Long.parseLong Long st.nextToken() st.nextToken st public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    } next {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    } while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      } st == null || !st.hasMoreTokens() st == null st null !st.hasMoreTokens() st.hasMoreTokens() st.hasMoreTokens st {
        st = new StringTokenizer(br.readLine());
      } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return st.nextToken(); st.nextToken() st.nextToken st public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    } nextDouble {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    } while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      } st == null || !st.hasMoreTokens() st == null st null !st.hasMoreTokens() st.hasMoreTokens() st.hasMoreTokens st {
        st = new StringTokenizer(br.readLine());
      } st = new StringTokenizer(br.readLine()) st new StringTokenizer(br.readLine()) return Double.parseDouble(st.nextToken()); Double.parseDouble(st.nextToken()) Double.parseDouble Double st.nextToken() st.nextToken st public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      }  
  }
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }

  }

} public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      }  
  }
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }

  }

} Main
import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.PrintWriter;
import java.util.StringTokenizer;

public class Main {
  static InputReader in;
  static PrintWriter out;

  static class Solution {
    void solve() throws IOException {
      while (true) {
        int H = in.nextInt();
        int W = in.nextInt();
        if (H == 0 && W == 0) break;
        
        for (int i = 0; i < H; i++) {
          if (i == 0 || i == H - 1) {            
            for (int j = 0; j < W; j++) {
              out.print("#");
            }
            out.print("\n");
          } else {
            out.print("#");
            for (int j = 1; j < W-1; j++) {
              out.print(".");
            }
            out.println("#");
          }
        }
        out.print("\n");
      }  
  }
}

  public static void main(String[] args) throws IOException {
    in = new InputReader(System.in);
    out = new PrintWriter(System.out);
    Solution solver = new Solution();
    solver.solve();
    out.close();
}

  static class InputReader {
    public BufferedReader br;
    public StringTokenizer st;

    public InputReader(InputStream stream) {
      br = new BufferedReader(new InputStreamReader(stream));
    }

    public int nextInt() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Integer.parseInt(st.nextToken());
    }

    public long nextLong() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Long.parseLong(st.nextToken());
    }

    public String next() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return st.nextToken();
    }

    public double nextDouble() throws IOException {
      while (st == null || !st.hasMoreTokens()) {
        st = new StringTokenizer(br.readLine());
      }
      return Double.parseDouble(st.nextToken());
    }

  }

}