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.Collections;
//using System.Linq;
//using System.Text;
//using System.Threading.Tasks;

//namespace _1_A
//{
class Program
{
    static void Main(string[] args)
    {
        ArrayList harray = new ArrayList();
        ArrayList warray = new ArrayList();
        int dat = 0, hid = 0, mig = 0;
        int[] iarray = new int[2];
        string inp = Console.ReadLine();
        string[] oup = inp.Split(' ');
        iarray[0] = int.Parse(oup[0]);
        iarray[1] = int.Parse(oup[1]);

        while (dat < 300)
        {
            if (iarray[0] == 0 && iarray[1] == 0)
                break;
            harray.Add(iarray[0]);
            warray.Add(iarray[1]);
            dat++;
            inp = Console.ReadLine();
            oup = inp.Split(' ');
            iarray[0] = int.Parse(oup[0]);
            iarray[1] = int.Parse(oup[1]);
        }

        int cnt = 0;
        for (; cnt < dat; ++cnt)
        {
            hid = Convert.ToInt32(harray[cnt]);
            mig = Convert.ToInt32(warray[cnt]);
            for (int i = 0; i < hid; i++)
            {
                for (int j = 0; j < mig; j++)
                {
                    if (i == 0 || i == (hid - 1) || i >= 1 && j == 0 || i <= (hid - 1) && j == 0 || i >= 1 && j == (mig - 1) || i <= (hid - 1) && j == (mig - 1))
                        Console.Write("#");
                    else
                        Console.Write(".");
                        
                }
                Console.WriteLine();
            }
            Console.WriteLine();

        }

        //Console.Read();
    }
}
//}