import java.util.Scanner;
public 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 a=0;a<W;a++){
        System.out.print("#");
      }
      System.out.println("");
      for(int i=0;i<H-2;i++){
        for(int j=0;j<W;j++){
          if(j==0 || j==W - 1){
            System.out.print("#");
          }
          else {
            System.out.print(".");
          }
        }
        System.out.println("");
      }
      for(int a=0;a<W;a++){
        System.out.print("#");
      }
    System.out.println("\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