import io.Source.stdin

object Main {

  def main(args: Array[String]) {
    for ((list) <- stdin.getLines().takeWhile(_ != "0 0").map(_.split(" ").map(_.toInt))) {
      val (h: Int, w: Int) = (list(0), list(1))
      printFrame(h, w)
    }
  }

  def printFrame(h: Int, w: Int) {
    for (i <- 1 to h) {
      for (j <- 1 to w) {
        printChar(isEdge(h, w, i, j))
      }
      println()
    }
    println()
  }
  
  def printChar(isEdge: Boolean) {
    if (isEdge) {
      print("#")
    } else {
      print(".")
    }
  }
  
  def isEdge(h: Int, w: Int, i: Int, j: Int): Boolean = {
    if (i == 1 || j == 1 || i == h || j == w) {
      true
    } else {
      false
    }
  }
}
