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;

class Program
{
    static void Main()
    {
            int i, j, x;
            int[] h = new int[2000];
            int[] w = new int[2000];
            for (i = 0; i < 2000; i++)
            {
                string inp = Console.ReadLine();
                string[] data = inp.Split();
                h[i] = int.Parse(data[0]);
                w[i] = int.Parse(data[1]);
                if (h[i] == 0 && w[i] == 0)
                {
                    break;
                }
            }
            for (x = 0; x < 2000; x++)
            {
                if (h[x] == 0 && w[x] == 0)
                {
                    break;
                }
                for (i = 0; i < h[x]; i++)
                {
                    for (j = 0; j < w[x]; j++)
                    {
                        if (i == 0 || j == 0 || i == h[x]-1 || j == w[x]-1)
                        {
                            Console.Write("#");
                        }else
                        {
                            Console.Write(".");
                        }
                    }
                    Console.Write("\n");
                }
                Console.Write("\n");
            }
    }
}