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: Wrong Answer)

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

namespace ITP1_5
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                string[] strArray = Console.ReadLine().Split(' ');
                int height = int.Parse(strArray[0]);
                int width = int.Parse(strArray[1]);

                if (height == 0 && width == 0)
                {
                    break;
                }

                for (int i = 0; i < height; ++i)
                {
                    // ??????????????????????±???????
                    char c;
                    if (i == 0 || i == (height-1)) 
                    {
                        c = '#';
                    }
                    else {
                        c = '.';
                    }

                    // 1?????????
                    Console.Write('#');
                    for (int h = 1; h < width-1; ++h)
                    {
                        Console.WriteLine(c);
                    }
                    Console.Write('#');
                    Console.WriteLine();
                }

                Console.WriteLine();
            }
        }
    }
}