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


namespace StartFinish
{
 
    class Program
    {
        static void Main(string[] args)
        {
            while (true)
            {
                int[] hw = Console.ReadLine().Split(' ').Select(int.Parse).ToArray();


                if (hw[0] == 0 && hw[1] == 0)
                {
                    break;
                }
                for(int i = 0; i < hw[0]; i++)
                {
                    if (i == 0||i==hw[0]-1)
                    {
                        for(int j = 0; j < hw[1]; j++)
                        {
                            Console.Write("#");
                        }
                    }else
                    {
                        for(int j = 0; j < hw[1]; j++)
                        {
                            if (j == 0||j==hw[1]-1)
                            {
                                Console.Write("#");
                            }else
                            {
                                Console.Write(".");
                            }
                        }
                    }
                    Console.WriteLine();
                }
                Console.WriteLine();
              
            }
        }
    }
}