#!/user/bin/python
# -*- coding: UTF-8 -*-
n, m = map(int, raw_input().strip().split(' '))
if n==1:
	print "*"*m
else:
	print "*"*m
	for i in range(2,n):
		if m==1:
			print "*"
		else:        
			print "*"+" "*(m-2)+"*"
	print "*"*m