# 打印正方形
for i in range(20):
if i % 2 == 0:
print("*", end="")
else:
print(" ", end="")
print()
for j in range(8):
for i in range(20):
if i == 0:
print("*", end="")
elif i == 18:
print("*")
breakelse:
print(" ", end="")
for i in range(20):
if i % 2 == 0:
print("*", end="")
else:
print(" ", end="")