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;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;


namespace ConsoleApp6
{
	class Program
	{
		static void Main(string[] args)
		{
			while (true)
			{
				string hw = Console.ReadLine();
				string[] sq = hw.Split(' ');

				int H = int.Parse(sq[0]);
				int W = int.Parse(sq[1]);

				int i, j;
				if (H == 0 && W == 0)
					break;

				for (i = 0; i < H; i++)
				{
					
					for (j = 0; j < W; j++)
					{
						if(j == 0 || j == W - 1 || i == 0 || i == H - 1)
						{
							Console.Write("#");
						}
						else
						{
							Console.Write(".");
						}
					}
					Console.WriteLine();
				}

				Console.WriteLine();

				//Console.ReadKey();
			}
		}
	}
}