import java.util.ArrayList;
import java.util.List;
import java.util.Scanner;

public class Main {

	public static void main(String[] args) {
		
		Scanner sc = new Scanner(System.in);
		
		List<int[]> hws = new ArrayList<>();
		while(true) {
			int H = sc.nextInt();
			int W = sc.nextInt();
			
			if(H == 0) break;	// 1 <=H.W<= 300
			
			int[] hw = new int[]{H, W};
			hws.add(hw);
			
		}
		sc.close();
		
		for(int[] hw : hws) {
			
			for(int hh = 0; hh < hw[0]; hh++) {
				for(int ww = 0; ww < hw[1]; ww++) {
					if (hh == 0 || hh == hw[0]-1 || ww == 0 || ww == hw[1]-1) {
						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