//y???0???a-1

import java.util.*;
import java.io.*;

public class Main{
    public static void main(String[] args)throws IOException{
    BufferedReader br = new BufferedReader(new InputStreamReader(System.in));    
        int a = 0;
        int b = 0;
        
            while(true){
                StringTokenizer st = new StringTokenizer(br.readLine(), " ");
                b = Integer.parseInt(st.nextToken());
                a = Integer.parseInt(st.nextToken());

                    if(a==0&&b==0)break;
                        for(int x = 0; x<b; x++){
                            
                
                            for(int y = 0; y<a; y++){
                                if(y==0||y==a-1||x==0||x==b-1){
                                    System.out.print("#");
                                }
                                else{
                                    System.out.print(".");
                                }
                                
                            }
                
                            System.out.print("\n");
                        }
            
                        System.out.print("\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