import java.util.*;

public class Main{
  public static void main(String[] args){
    Scanner scanner = new Scanner(System.in);
    while(true){
      int a = scanner.nextInt();
      int b = scanner.nextInt();
      if(a == 0 && b == 0){
        break;
      }

      for(int j = 0; j < a; j++){
        if(j != 0){
          System.out.print("\n");
        }
        for(int k = 0; k < b; k++){
          if(j == 0 || j == a - 1 || k == 0 || k == b - 1){
            System.out.print("#");
          }
          else{
            System.out.print(".");
          }
        }
      }
      System.out.print("\n\n");
    }
  }
  }
/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