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 PrintRectangle
{
    class MainClass
    {
        public static void Main (string[] args)
        {
            while (true) {
                string[] tmp = Console.ReadLine ().Split (" ".ToCharArray ());
                int height, Wide;
 
                height = int.Parse (tmp [0]);
                Wide = int.Parse (tmp [1]);
                if (height == 0 && Wide == 0)
                    break;
 
                for (int i = 1; i <= height; i++) {
                    for (int j = 1; j <= Wide; j++) {
                        Console.Write ((i == 1 || i == height ||j == 1||j==Wide)? "#":".");
                    }
                    Console.Write ("\n");
                }
                Console.Write ("\n");
            }
        }
    }
}