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;
using System.Collections.Generic;

class Program {
    static int Main(string[] args) {
        List<int[]> list = new List<int[]>();

        while (true) {
            string v = Console.ReadLine();

            int H = int.Parse(v.Split(' ')[0]);
            int W = int.Parse(v.Split(' ')[1]);
            if ((H == 0) && (W == 0)) { break; }

            list.Add(new int[] { H, W });
        }

        for (int i = 0; i < list.Count; i++) {
            for (int h = 0; h < list[i][0]; h++) {
                for (int w = 0; w < list[i][1]; w++) {
                    if ((h == 0) || (h == list[i][0] - 1) || (w == 0) || (w == list[i][1] - 1)) {
                        Console.Write("#");
                    }
                    else {
                        Console.Write(".");
                    }
                }
                Console.WriteLine("");
            }

            Console.WriteLine("");
        }

        return 0;
    }
}