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;

class A{
	public static void Main(){


		while (true) {
			string[] input = Console.ReadLine ().Split (' ');
			int H = int.Parse (input [0]);
			int W = int.Parse (input [1]);
		 
			if (H == W && H == 0) {
				break;
			}
		
			for (int x =0; x<H; x++) {
				for (int i =0; i<W; i++) {
					if(x==0 || x==H-1 || i==0 | i==W-1){
							Console.Write("#");
					}else{
						Console.Write(".");
					}
				}
				Console.WriteLine ();
			}
			Console.WriteLine ();
		}	
	}

}