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;

namespace std
{
    class Test {
        static void Main(string[] args) {
       
            List<int> ary_H= new List<int>();
            List<int> ary_W= new List<int>();
           
           
            while(true) {
                var input = Console.ReadLine().Split(' ');
                var H = int.Parse(input[0]);
                var W = int.Parse(input[1]);
            
                if(H == 0 && W == 0) break;
                ary_H.Add(H);
                ary_W.Add(W);
            }        
       
            for ( int k = 0; k < ary_H.Count; k++) {
                for ( int i = 0; i < ary_H[k]; i++) {
                  
  		    for ( int j = 0; j < ary_W[k]; j++) {
                        if (i == 0 || i == ary_H[k]-1 ) {Console.Write("#");}
                        else if (j == 0 || j == ary_W[k]-1) {Console.Write("#");}
                        else { Console.Write(".");}
                    }
                     Console.WriteLine("");  //改行
                }
                 Console.WriteLine("");//空行
		
            }  
          //   Console.WriteLine("");
       
       
        }
    }
}