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 <- io.Source.stdin.getLines() if line != "0 0") {
      val H = line.split(" ")(0).toInt
      val W = line.split(" ")(1).toInt

      for (i <- 0 until H) {
        if (i == 0 || i == H - 1) {
          println("#" * W)
        }
        else {
          println("#" + ("." * (W - 2) +"#"))
        }
      }
      println()
    }
  }
}