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: Time Limit Exceeded)

package main

import (
	"fmt"
)

func main(){
	var a, b int
	for{
		fmt.Scan(&a, &b)
		for i:=0; i<a; i++{
			for j:=0; j<b; j++{
				if i == 0 || i == a-1 || j == 0 || j == b-1 {
					fmt.Print("#")
				}else{
					fmt.Print(".")
				}
			}
			fmt.Print("\n")
		}
		fmt.Print("\n")
	}
}