소스 코드 제출

# a,b=map(int,input().split())# s=0# for i in range(a,b+1) :#     if i%3==0 :#         s=s+i# print(s)# a,b=map(int,input().split())# c=0# for i in range(a,b+1) :#     if i%2==0 :#         c=c-i#     else :#         c=c+i##  rlaqhals# print(c)# a,b=map(int,input().split())# s=0# for i in range(a,b+1) :#     if(i%2==0) :#         s=s-i#         print("+",i)#     else :# #         s=s+i# #         print('-',i)# # print("=",s)# a,b,c=map(int,input().split())# print(a*b**(c-1))# a,m,d,n=map(int,input().split())# s=a# for i in range(1,n) :#     s=s*m#     s=s+d# print(s)# a,b=map(int,input().split())# s=0# for i in range(a,b+1) :#     if(i%2==0) :#         s=s-i#         print("-",i,sep='',end='')#     else :#         s=s+i#         print('+',i,sep='',end='')# print("=",s,sep='',end='')# a = int(input())# for i in range(a) :#     print('*'*a)## a=int(input())# for i in range(a):#     print("*"*a)# a=int(input())# for i in range(a) :#     print("*"*(i+1))# a=int(input())# for i in range(a,0,-1) :#     print("*"*i)# a=int(input())# for i in range(a) :#     print(" "*i,end='')#     print('*'*(a-i))# a=int(input())# for i in range(a):#     for j in range(a) :#         if(i==0 or i==a-1 or j==0 or j==a-1) :#             print('*',end='')#         else :#             print(' ',end='')#     print("\n")#a=int(input())for j in range(a) :    if(j==0 or j==a-1) :        print('*'*a)    else :        print('*'+' '*(a-2)+'*')