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.IO;

namespace AizuOnline
{
    internal class Program
    {
        private static void Main(string[] args)
        {
            var H = new int[1000];
            var W = new int[1000];
            var i = 0;

            while (true)
            {
                var x = Console.ReadLine().Split(' ');

                H[i] = Convert.ToInt32(x[0]);
                W[i] = Convert.ToInt32(x[1]);
                if (H[i] == 0)
                {
                    break;
                }
                i++;
            }

            for (int m = 0; m < H.Length && H[m] != 0; m++)
            {
                for (int k = 0; k < H[m]; k++)
                {
                    for (int j = 0; j < W[m]; j++)
                    {
                        if (k == 0 || k == H[m] - 1 || j == 0 || j == W[m] - 1)
                        {
                            Console.Write("#");
                        }
                        else
                        {
                            Console.Write(".");
                        }
                    }
                    Console.WriteLine();
                }
                Console.WriteLine();
            }

            Console.ReadLine();
        }
    }
}