n = int(input())

for num in range(0, n):
    print ('*', end = '')

print('')

for num in range(0, n - 2):

    print('*', end = '')
    for num in range(0, n-2):
        print(' ', end = '')
    print('*', end = '')

    print('')

for num in range(0, n):
    print('*', end = '')