import java.util.Scanner;

class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        do {
            int h = sc.nextInt();
            int w = sc.nextInt();

            if (h == 0 && w == 0) {
                break;
            } else {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            }

        } while (true);
    }

} import java.util.Scanner; Scanner java.util class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        do {
            int h = sc.nextInt();
            int w = sc.nextInt();

            if (h == 0 && w == 0) {
                break;
            } else {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            }

        } while (true);
    }

} Main public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        do {
            int h = sc.nextInt();
            int w = sc.nextInt();

            if (h == 0 && w == 0) {
                break;
            } else {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            }

        } while (true);
    } main {
        Scanner sc = new Scanner(System.in);

        do {
            int h = sc.nextInt();
            int w = sc.nextInt();

            if (h == 0 && w == 0) {
                break;
            } else {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            }

        } while (true);
    } Scanner sc = new Scanner(System.in); sc new Scanner(System.in) do {
            int h = sc.nextInt();
            int w = sc.nextInt();

            if (h == 0 && w == 0) {
                break;
            } else {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            }

        } while (true); true {
            int h = sc.nextInt();
            int w = sc.nextInt();

            if (h == 0 && w == 0) {
                break;
            } else {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            }

        } int h = sc.nextInt(); h sc.nextInt() sc.nextInt sc int w = sc.nextInt(); w sc.nextInt() sc.nextInt sc if (h == 0 && w == 0) {
                break;
            } else {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            } h == 0 && w == 0 h == 0 h 0 w == 0 w 0 {
                break;
            } break; {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            } for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.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++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                } {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                } if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    } i == 0 || i == h-1 i == 0 i 0 i == h-1 i h-1 h 1 {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        } int j = 0; int j = 0; j 0 j < w j w j++ j++ j {
                            System.out.print('#');
                        } {
                            System.out.print('#');
                        } System.out.print('#') System.out.print System.out System System.out '#' {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    } for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        } int j = 0; int j = 0; j 0 j < w j w j++ j++ j {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        } {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        } if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            } j==0 || j==w-1 j==0 j 0 j==w-1 j w-1 w 1 {
                                System.out.print('#');
                                
                            } System.out.print('#') System.out.print System.out System System.out '#' {
                                System.out.print('.');
                            } System.out.print('.') System.out.print System.out System System.out '.' System.out.println() System.out.println System.out System System.out System.out.println() System.out.println System.out System System.out String[] args args
import java.util.Scanner;

class Main {

    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);

        do {
            int h = sc.nextInt();
            int w = sc.nextInt();

            if (h == 0 && w == 0) {
                break;
            } else {
                for (int i = 0; i < h; i++) {
                    if (i == 0 || i == h-1) {

                        for (int j = 0; j < w; j++) {
                            System.out.print('#');
                        }

                    } else {
                        
                        for (int j = 0; j < w; j++) {
                            if (j==0 || j==w-1) {
                                System.out.print('#');
                                
                            } else {
                                System.out.print('.');
                            }
                            
                        }
                    }
                    System.out.println();
                }

                System.out.println();
            }

        } while (true);
    }

}