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.Linq;
using System.Collections.Generic;
namespace _5_B
{
    class Program
    {
        static void Main(string[] args)
        {
            List<int> H = new List<int>();
            List<int> W = new List<int>();
            while (true)
            {
                int[] x = Console.ReadLine().Split().Select(int.Parse).ToArray();
                if (x[0] == 0 && x[1] == 0)
                {
                    break;
                }
                else
                {
                    H.Add(x[0]);
                    W.Add(x[1]);
                }
            }
            for (int X = 0; X < H.Count; X++)
            {
                for (int i = 0; i < W[X]; i++)
                {
                    Console.Write("#");
                }
                Console.WriteLine();
                for (int i = 1; i < H[X] - 1; i++)
                {
                    Console.Write("#");
                    for (int I = 1; I < W[X] - 1; I++)
                    {
                        Console.Write(".");
                    }
                    Console.WriteLine("#");
                }
                for (int i = 0; i < W[X]; i++)
                {
                    Console.Write("#");
                }
                Console.WriteLine();
                Console.WriteLine();
            }
        }
    }
}