Problem:
Print a Frame

Draw a frame which has a height of H cm and a width of W cm. For example, the following figure shows a frame which has a height of 6 cm and a width of 10 cm.

##########
#........#
#........#
#........#
#........#
##########

Input

The input consists of multiple datasets. Each dataset consists of two integers H and W separated by a single space.

The input ends with two 0 (when both H and W are zero).

Output

For each dataset, print the frame made of '#' and '.'.

Print a blank line after each dataset.

Constraints

3 ≤ H ≤ 300

3 ≤ W ≤ 300

Sample Input

3 4
5 6
3 3
0 0

Sample Output

####
#..#
####

######
#....#
#....#
#....#
######

###
#.#
###

Solution in C# (judge verdict: Accepted)

using System;

namespace PrintRectangle
{
	class MainClass
	{
		public static void Main (string[] args)
		{
			while (true) {
				string[] tmp = Console.ReadLine ().Split (" ".ToCharArray ());
				int height, Wide;

				height = int.Parse (tmp [0]);
				Wide = int.Parse (tmp [1]);
				if (height == 0 && Wide == 0)
					break;

				for (int i = 1; i <= height; i++) {
					for (int j = 1; j <= Wide; j++) {
						Console.Write ((i == 1 || i == height ||j == 1||j==Wide)? "#":".");
					}
					Console.Write ("\n");
				}
				Console.Write ("\n");
			}
		}
	}
}