import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		Scanner scan = new Scanner(System.in);
		scan.useDelimiter("\\s"); //?????????????????´??????????????¨?????±???????????????\\???????????????
		int i = 0;
		while(i == 0) {
			int h = scan.nextInt();//??´??°??\????????????
			int w = scan.nextInt();//??´??°??\???????¨?)
			if (h == 0 && w == 0) {  //h w???0?????¨????????????
				break;
			} else if (h > 0){  //0??§???????????£?????¨????????????
				for (int j = 0; j < h; j++) { //j???h????????§?????????????????§??????
					for (int k = 0; k < w; k++) { //k???w????????§?????????????????§??????
						if(j==0 || k==0 || j==h-1 || k==w-1){
							/*
							 ??????j???0?????????k???0?????????j???h-1?????????k???w-1?????£???
							 ??´???????????????"#"
							 */
							System.out.print("#");
						} else {
							System.out.print(".");
							}
					}
						System.out.println();//\\s??§??????
				}
					System.out.println();//\\s??§??????
			}
		}
	}
}
/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