Valid IPv4 Address
Is S a valid dotted-decimal IPv4 address? Four parts 0–255, no leading zeros (except 0 itself).
Input: one line with the candidate string S.
Output: YES or NO.
Constraints:
- 1 ≤ |S| ≤ 100
Sample Tests
Input 1
192.168.0.1
Output 1
YES
Input 2
192.168.01.1
Output 2
NO
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