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;

public class Test
{
	public static void Main()
	{
            string[] data;
            int H, W;//???????¨?
            while(true){

                data = Console.ReadLine().Split();
                if (int.Parse(data[0])== 0 && int.Parse(data[1]) == 0)
                {
                    break;
                }

                for (H = int.Parse(data[0]); H > 0; H--)
                {
                    for (W = int.Parse(data[1]); W > 0; W--)
                    {
                        if (H != 1 && W!=1 && H!=int.Parse(data[0]) && W != int.Parse(data[1]))
                        {
                            Console.Write(".");
                        }
                        else
                        {
                            Console.Write("#");
                        }                  
                    }
                    Console.WriteLine();
                }
                Console.WriteLine();
            }
	}
}