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;

class P
{
public static void Main()
{
 while (true)
            {
                //????????????????????????
                var a = Console.ReadLine().Split(' ');

                //??????
                int H = Int32.Parse(a[0]);
                int W = Int32.Parse(a[1]);
                int h = 0;
                int w = 0;

                if (H == 0 && W == 0)
                {
                    break;          //??????
                }
                else
                {
                    for (h = 1; h <= H; h++)
                    {
                        for (w = 1; w <= W; w++)
                        {
                            if (w == 1 || w == W || h == 1 || h == H)
                            {
                                if (w == W && h == H)       //??????????§?
                                {
                                    Console.Write("#\n\n");
                                }
                                else
                                {
                                    Console.Write("#");
                                }
                            }
                            else
                            {
                                Console.Write(".");
                            }

                        }
                    }
                }
            }
}
}