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 i = 1;i <= H;i++){
			for(int j = 1;j <= W;j++){
				if(i==1||i==H||j==1||j==W){
					System.out.print("#");
				}else{
					System.out.print(".");
				}
			}
			System.out.println();
		}
		System.out.println();
		}
	}
}
/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