题解 | #合法IP#
合法IP
http://www.nowcoder.com/practice/995b8a548827494699dc38c3e2a54ee9
while True:
try:
inpt = input().split('.')
for i in inpt:
if int(i) < 0 or int(i) > 255:
print('NO')
break
else:
print('YES')
except:
break
