소스 코드 제출

'''
n = int(input())

for i in range(n//2+1):
    for j in range(i,n//2):
        print(' ',end='')
    for j in range(i*2+1):
        print('*',end='')
    print()
'''
'''
n = int(input())
for i in range(n):
    for j in range(n):
        if i==0 or j==0 or i==n-1 or j==n-1:          #0~n-1
            print('*',end='')
        else:
            print(' ',end='')
    print()
'''
n,k = input().split()
n = int(n)
k = int(k)

for i in range(n):
    for j in range(n):
        if i==0 or j==0 or i==n-1 or j==n-1 or i==k%3==0 or j==k:
            print('*',end='')
        else:
            print(' ',end='')
    print()