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;

namespace Aizu
{
    class OnlineJudge
    {
        public static void Main()
        {
            int[] input;
            while(((input = Console.ReadLine().Split().Select(p => int.Parse(p)).ToArray())[0] | input[1]) != 0) {
                Console.WriteLine(new String('#', input[1]));
                for(int i = 0; i < input[0] - 2; ++i){
                    Console.WriteLine("#{0}#", new String('.', input[1] - 2));
                }
                Console.WriteLine(new String('#', input[1]));
                Console.WriteLine();
            }
        }
    }
}