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

class Main{
    public static void main(String args[])throws IOException{
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        while(true){
            //String s = br.readLine();
            String[] str = br.readLine().split(" ");
            int h = Integer.parseInt(str[0]);
            int w = Integer.parseInt(str[1]);
            if(h == 0 || w == 0) break;
            for(int i=0;i<h; i++){
                System.out.print("");
                for(int j=0; j<w-1; j++){
                    if((j>0 && j<w-1) && (i>0 && i<h-1)){
                        System.out.print(".");
                    }else{
                        System.out.print("#");
                    }
                }
                System.out.println("#");
            }
            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