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;

namespace ConsoleApplication36
{
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                string s = Console.ReadLine();
                string[] ss = s.Split(' ');
                int H = int.Parse(ss[0]);
                int W = int.Parse(ss[1]);
                int j;
                int x;
                if (H == 0 && W == 0)
                {
                    break;
                }
                else
                {
                    for (x = 0; x < H; x++)
                    {
                        if(x == 0)
                        {
                            for (j = 0; j < W; j++)
                            {
                                Console.Write("#");
                            }

                        }
                        else if(x > 0 && H - 1 >x)
                        {
                            Console.Write("#");
                            for (j = 2; j < W; j++)
                            {
                                Console.Write(".");
                            }
                            Console.Write("#");
                        }else if(x == H - 1)
                        {
                             for (j = 0; j < W; j++)
                            {
                                Console.Write("#");
                            }
                        }
                        Console.WriteLine("");
                    }
                    Console.WriteLine("");
                }
            }
        }
    }
}