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 Example {
    public static void Main() {
        while (true) {
            int[] size = Array.ConvertAll<string, int>(Console.ReadLine().Split(' '), delegate(string value) {
                return int.Parse(value);
            });
            if (size[0] == 0 && size[1] == 0) break;
            for (int i = 0; i < size[0]; i++) {
                for (int j = 0; j < size[1]; j++) {
                    Console.Write(i == 0 || i == size[0]-1 || j == 0 || j == size[1]-1 ? "#" : ".");
                }
                Console.WriteLine();
            }
            Console.WriteLine();
        }
    }
}