import java.io.*;
public class Main{
	public static void main(String[] args)throws Exception{
		BufferedReader input=new BufferedReader(new InputStreamReader(System.in));
		StringBuilder sb=new StringBuilder();
		while(true){
		String str=input.readLine();
		String[] arr=str.split(" ");
		int h=Integer.parseInt(arr[0]);	
		int w=Integer.parseInt(arr[1]);
		if(h==0&&w==0){
			break;
		}
	
		for(int i=0;i<h;i++){

			for(int j=0;j<w;j++){
				if(i==0||i==h-1||j==0||j==w-1){
				sb.append("#");
				}else{
					sb.append(".");
				}
			}
				sb.append("\n");
		}
			sb.append("\n");

			}
		
		
		
		System.out.print(sb);
	}
}
/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