题解 | #合法IP#
合法IP
http://www.nowcoder.com/practice/995b8a548827494699dc38c3e2a54ee9
try:
ip = input().split('.')
if 0<=int(ip[0]) <256 and 0<=int(ip[1]) <256 and 0<=int(ip[2]) <256 and 0<=int(ip[3]) <256 and ip[0]==str(int(ip[0])) and ip[1]==str(int(ip[1])) and ip[2]==str(int(ip[2])) and ip[3]==str(int(ip[3])) and len(ip)==4:
print('YES')
else:
print('NO')
except:
print('NO')
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