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;

namespace ITP1_5_B
{
    class Program
    {
        static void Main()
        {
            while (true)
            {
                string[] x = Console.ReadLine().Split(' ');
                int h = int.Parse(x[0]);
                int w = int.Parse(x[1]);
                
                if (h == 0 && w == 0) break;
                
                for (int i = 0; i < w; i ++)
                {
                    Console.Write("#");
                }
                Console.WriteLine();
                
                
                for (int j = 0; j < h - 2; j ++)
                {
                    Console.Write("#");
                    for (int k = 0; k < w -2; k ++)
                    {
                        Console.Write(".");
                    }
                    Console.Write("#");
                }
                Console.WriteLine();
                
                for (int l = 0; l < w; l ++)
                {
                    Console.Write("#");
                }
                Console.WriteLine();
            }
        }
    }
}