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;

class Program
{
    static void Main()
    {
        while (true)
        {
            string[] raw = Console.ReadLine().Split(' ');
            if(raw[0]=="0")break;
            int h = int.Parse(raw[0]);
            int w = int.Parse(raw[1]);
            for (int x = 0; x < w; x++) Console.Write('#');
            Console.WriteLine();
            for(int y=1;y<h-1;y++){
                Console.Write('#');
                for(int x=1;x<w-1;x++)Console.Write('.');
                Console.WriteLine('#');
            }
            for (int x = 0; x < w; x++) Console.Write('#');
            Console.WriteLine();
            Console.WriteLine();
        }
    }
}