1027: Print a frame

内存限制:128 MB 时间限制:1.000 S 标准输入输出
题目类型:传统 评测方式:文本比较 上传者:
提交:1727 通过:722

题目描述

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.


##########
#........#
#........#
#........#
#........#
##########

输入格式

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). 


输出格式

For each dataset, print the frame made of '#' and '.'.


Print a blank line after each dataset.


输入样例 复制

3 4
5 6
3 3
0 0

输出样例 复制

####
#..#
####

######
#....#
#....#
#....#
######

###
#.#
###

数据范围与提示

  • 3 ≤ H ≤ 300
  • 3 ≤ W ≤ 300