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 Go (judge verdict: Accepted)

package main

import (
	"fmt"
)

const (
	frame    = '#'
	contents = '.'
)

func main() {
	var h, w int
	for {
		fmt.Scanln(&h, &w)
		if h == 0 && w == 0 {
			break
		}
		for i := 0; i < h; i++ {
			for j := 0; j < w; j++ {
				if j == 0 || j == w-1 || i == 0 || i == h-1 {
					fmt.Printf("%c", frame)
				} else {
					fmt.Printf("%c", contents)
				}
			}
			fmt.Printf("\n")
		}
		fmt.Printf("\n")
	}
	return
}