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 {
  def main(args:Array[String]):Unit = {
    for (line <- scala.io.Source.stdin.getLines() if line != "0 0") {
      val Array(h, w) = line.split(" ").map(_.toInt)
      println("#" * w)
      for (i <- 1 to h-2) {
        println("#" + "." * (w-2) + "#")
      }
      println("#" * w + "\n")
    }
  }
}