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 aoj
{
    static void Main()
    {
        for (;;)
        {
            string a = Console.ReadLine();
            char b = ' ';
            string[] c = a.Split(b);
            int d, e;
            d = int.Parse(c[0]);
            e = int.Parse(c[1]);
            if (d == 0 && e == 0) break;
            for (int i = 0; i < d; i++)
            {
                for (int j = 0; j < e; j++)
                {
                    if (0 < i && i < d - 1)
                    {
                        if (j == 0 || j == e - 1)
                        {
                            Console.Write("#");
                        }
                        else
                        {
                            Console.Write(".");
                        }
                    }
                    else
                    {
                        Console.Write("#");
                    }
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
}