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;

namespace IPT1_5B
{
    class Program
    {
        static void Main(string[] args)
        {
            int numH, numW;

            while (true)
            {
                string[] inString = Console.ReadLine().Split(' ');

                numH = int.Parse(inString[0]);
                numW = int.Parse(inString[1]);
                if ((numH == 0) && (numW == 0)) break;
                for (int i = 0; i < numH; i++)
                {
                    for (int j = 0; j < numW; j++)
                    {
                        if ((i == 0) || (i == numH - 1)) Console.Write("#");
                        else if ((j == 0) || (j == numW - 1)) Console.Write("#");
                        else Console.Write(".");
                    }
                    Console.Write("\n");
                }
                Console.Write("\n");
            }
        }
    }
}