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: 100ms
Memory: 24436kB
Author: huangchongding
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)