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 Scala (judge verdict: Accepted)

object Main extends App {
	override def main(args: Array[String]) = {
		val sc = new java.util.Scanner(System.in)
		
		val pw = new java.io.PrintWriter(System.out);
		
		Iterator.continually(new Rectangle(sc.nextInt,sc.nextInt))
			.takeWhile(_.isContinue)
			.foreach(_.print(pw))

		pw.flush
		
	}
	
	class Rectangle(val H: Int, val W:Int){
		val isContinue = !(H == 0 && W == 0)
		
		def print(pw : java.io.PrintWriter):Unit = {
			for(i <- (1 to H)){
				for(j <- (1 to W)){
					(i,j) match{
						case (1,_) | (H,_) =>
							pw.print("#")
						case (_,1) | (_,W) =>
							pw.print("#")
						case (_,_) => 
							pw.print(".")
					}
				}
				pw.println
			}
			pw.println
		}
		
	}
}