#!/usr/bin/python
#-*-coding:utf-8 -*-
i,j = map(int,raw_input().strip().split())
m=1
n=1
s=""
while m<=i:
	while n<=j:
		if (m<>1 and m<>i and n<>1 and n<>j):
			s=s+' '
		else:
			s=s+"*"
		n=n+1
	print s
	m=m+1
	s=""
	n=1