Start: Nov, 12, 2017 10:00:00
2017秋Python程序设计基础培训第一次作业
End: Nov, 19, 2017 12:00:00
Time elapsed:
Time remaining:
Problem_ID: C
Result: Accepted
Time: 98ms
Memory: 24436kB
Author: digy
In contest: 1121 
n,m = list(map(int,input().split()))
if n>1:
   print("*"*m,"\n",("*"+" "*(m-2)+"*\n")*(n-2),"*"*m,sep="")
else:
   print("*"*m,sep="")