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 x = 0; x < H; x++){
        for(int y = 0; y < W; y++){
          if(x == 0 || y == 0 || x == H-1 || y == W-1){
            System.out.print("#");
          }else{
            System.out.print(".");
          }
        }
        System.out.println("");
      }
      System.out.println("");
    }
  }
}


/tmp/hf-datasets-cache/medium/datasets/42704881117311-config-parquet-and-info-qiankunmu-Project_CodeNet-896c9d36/hub/datasets--qiankunmu--Project_CodeNet_Python800_and_Java250/snapshots/c899fde44a77ba1cc14973ed3de064e4ff3aadc7/Project_CodeNet_Java250.tar.gz