#!/usr/bin/python
# -*- coding: UTF-8 -*-
n,m=map(int,raw_input().strip().split())
if (n>0 and n<10) or (m>0 and m<10):
    if n==1:        
        print m*"*"
    else:
        print m*"*"
        for i in range(n-2):
            print "*"+(int(m)-2)*" "+"*"
        print m*"*"