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;

namespace ITP1_5_B
{
	class Program
	{
		static void Main(string[] args)
		{
			List<Tuple<int, int>> ts = new List<Tuple<int, int>>();

			while(true) {
				string[] vs = Console.ReadLine().Split(' ');

				int h = int.Parse(vs[0]);
				int w = int.Parse(vs[1]);

				if(h == 0 && w == 0) {
					break;
				}

				ts.Add(Tuple.Create(h, w));
			}

			foreach(Tuple<int, int> t in ts) {
				for(int i = 0; i < t.Item1; i++) {
					for(int j = 0; j < t.Item2; j++) {
						if(i == 0 || i == t.Item1 - 1) {
							Console.Write("#");
						}
						else if(j == 0 || j == t.Item2 - 1) {
							Console.Write("#");
						}
						else {
							Console.Write(".");
						}
					}
					Console.WriteLine();
				}

				Console.WriteLine();
			}
		}
	}
}