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;
using System.Linq;
using System.Text;

namespace ConsoleApplication3
{
class Program
{
    static void Main(string[] args)
    {
          
        while (true)
        {
            string[] str = Console.ReadLine().Split(' ');
            int tate = int.Parse(str[0]);
            int yoko = int.Parse(str[1]);

            if ((tate == 0) && (yoko == 0))
            {
                break;
            }
            for (int i = 1; i <= tate; ++i)
            {
                for (int j = 1; j <= yoko; ++j)
                { 
                    if ((i == 1) || (i == tate) || (j == 1) || (j == yoko))
                    {
                        Console.Write("#");
                    }
                    else
                    {
                        Console.Write(".");
                    }
                }
                Console.WriteLine();
            }
            Console.WriteLine(); 
            } 
        }
    }
}