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 AOJ.intro
{
    namespace ITP_1_5_B
    {
        static public class PrintAFrame
        {
            static public void Main()
            {
                while (true)
                {
                    int[] size = Array.ConvertAll<string, int>(Console.ReadLine().Split(' '), delegate(string value)
                    {
                        return int.Parse(value);
                    });
                    int H = size[0];
                    int W = size[1];
                    if (H == 0 && W == 0) break;
                    if (H < 3 || W < 3)
                    {
                        Console.WriteLine("3以上いれてください。"); return;
                    }
                    for (int i = 0; i < H; i++)
                    {
                        for (int j = 0; j < W; j++)
                        {
                            if(i == 0 || i == H - 1 || j == 0 || j == W - 1)
                            {
                                Console.Write("#");
                            }
                            else
                            {
                                Console.Write(".");
                            }
                        }
                        Console.WriteLine();
                    }
                    Console.WriteLine();
                }
            }

        }
    }
}