import java.util.Scanner;

class Main{
  public static void main (String[] args){
    Scanner sc = new Scanner(System.in);
      while (true){
        int H = sc.nextInt();
        int W = sc.nextInt();
        if ((H == 0) && (W == 0)) break;
          for(int h = 0; h < W; h++){
            System.out.print("#");
          }
          System.out.println("");


            for(int i = 0; i < H-2 ; i++){
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              }
          for(int k = 0; k < W; k++){
            System.out.print("#");
          }
          System.out.println("");
          System.out.println("");
  }
}
} import java.util.Scanner; Scanner java.util class Main{
  public static void main (String[] args){
    Scanner sc = new Scanner(System.in);
      while (true){
        int H = sc.nextInt();
        int W = sc.nextInt();
        if ((H == 0) && (W == 0)) break;
          for(int h = 0; h < W; h++){
            System.out.print("#");
          }
          System.out.println("");


            for(int i = 0; i < H-2 ; i++){
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              }
          for(int k = 0; k < W; k++){
            System.out.print("#");
          }
          System.out.println("");
          System.out.println("");
  }
}
} Main public static void main (String[] args){
    Scanner sc = new Scanner(System.in);
      while (true){
        int H = sc.nextInt();
        int W = sc.nextInt();
        if ((H == 0) && (W == 0)) break;
          for(int h = 0; h < W; h++){
            System.out.print("#");
          }
          System.out.println("");


            for(int i = 0; i < H-2 ; i++){
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              }
          for(int k = 0; k < W; k++){
            System.out.print("#");
          }
          System.out.println("");
          System.out.println("");
  }
} main {
    Scanner sc = new Scanner(System.in);
      while (true){
        int H = sc.nextInt();
        int W = sc.nextInt();
        if ((H == 0) && (W == 0)) break;
          for(int h = 0; h < W; h++){
            System.out.print("#");
          }
          System.out.println("");


            for(int i = 0; i < H-2 ; i++){
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              }
          for(int k = 0; k < W; k++){
            System.out.print("#");
          }
          System.out.println("");
          System.out.println("");
  }
} Scanner sc = new Scanner(System.in); sc new Scanner(System.in) while (true){
        int H = sc.nextInt();
        int W = sc.nextInt();
        if ((H == 0) && (W == 0)) break;
          for(int h = 0; h < W; h++){
            System.out.print("#");
          }
          System.out.println("");


            for(int i = 0; i < H-2 ; i++){
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              }
          for(int k = 0; k < W; k++){
            System.out.print("#");
          }
          System.out.println("");
          System.out.println("");
  } true {
        int H = sc.nextInt();
        int W = sc.nextInt();
        if ((H == 0) && (W == 0)) break;
          for(int h = 0; h < W; h++){
            System.out.print("#");
          }
          System.out.println("");


            for(int i = 0; i < H-2 ; i++){
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              }
          for(int k = 0; k < W; k++){
            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; (H == 0) && (W == 0) (H == 0) H 0 (W == 0) W 0 break; for(int h = 0; h < W; h++){
            System.out.print("#");
          } int h = 0; int h = 0; h 0 h < W h W h++ h++ h {
            System.out.print("#");
          } {
            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 "" for(int i = 0; i < H-2 ; i++){
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              } int i = 0; int i = 0; i 0 i < H-2 i H-2 H 2 i++ i++ i {
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              } {
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              } System.out.print("#") System.out.print System.out System System.out "#" for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                } int j = 0; int j = 0; j 0 j < W-2 j W-2 W 2 j++ j++ j {
                System.out.print(".");
                } {
                System.out.print(".");
                } System.out.print(".") System.out.print System.out System System.out "." System.out.print("#") System.out.print System.out System System.out "#" System.out.println("") System.out.println System.out System System.out "" for(int k = 0; k < W; k++){
            System.out.print("#");
          } int k = 0; int k = 0; k 0 k < W k W k++ k++ k {
            System.out.print("#");
          } {
            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);
      while (true){
        int H = sc.nextInt();
        int W = sc.nextInt();
        if ((H == 0) && (W == 0)) break;
          for(int h = 0; h < W; h++){
            System.out.print("#");
          }
          System.out.println("");


            for(int i = 0; i < H-2 ; i++){
              System.out.print("#");
              for(int j = 0;  j < W-2 ; j++){
                System.out.print(".");
                }
                System.out.print("#");
                System.out.println("");
              }
          for(int k = 0; k < W; k++){
            System.out.print("#");
          }
          System.out.println("");
          System.out.println("");
  }
}
}
