# Write a program that asks for an integer n, which
# can be assumed to be no smaller than 3, and draws a
# square of asterisks with side length n

# For ex if n is 3, the square should look like:
# ***
# * *
# ***

# If n is 8,
# the square should look like:

# ********
# *      *
# *      *
# *      *
# *      *
# *      *
# *      *
# ********

n = int(raw_input("What is the length of a side? "))
print '*' * n # draw top
for i in range(n-2):
    print '*' + ' ' * (n-2) + '*'

print '*' * n # draw bottom